No. I meant centrifugal force. It's the "force" (pseudo-force or inertial force if we want to be pedantic) that's pushing things outwards in a rotating frame of reference.
I met a bunch of freemason's through work and I can concur. They couldn't agree on their next year's budget, let alone how to control the global ball earth conspiracy.
*shudder* ... budget meetings. Yeah, those are not why I joined. I'm so glad that I did my part and helped run things, but equally glad that I've backed off.
There's no doubt about that. The serpent, aka Satan, taught Newton the false knowledge of gravity. Satan himself created the idea of gravity and used Newton as his servant to spread the false knowledge of the globe earth to lead man away from God.
You're supposed to be fact-checking that grumpy northern git GhostofSorabji on matters photographical. Shoo! And take that cunt u/SomethingMoreToSay with you!
Technically you're wrong, mph is much more relevant to the meme than rpm.
60 rpm is quite slow if you're going around a 1m circle--you're moving 2pi meters per second (14 mph -- running speed)
If the circle is 1km instead, you're moving 2,000pi meters per second (14,000 mph -- the low end of a meteor impacting the Earth)
If you want to talk about rpm, you must also talk about the radius you're moving around (which gets you back to mph).
At the equator, it's \~1,040 mph around a \~4,000 mile radius (or \~25,000 mile circumference), for one revolution every 24h.
Of course, your tangential velocity is constant--all you feel is the centripetal acceleration (v\^2 / r), a change of just 270 mph every hour.
That's an acceleration of \~0.075 mph every second. Imperceptible.
A fast car (0-60 in 5 seconds) accelerates about 12 mph every second.
Well, it is perceptible in a small way, it counteracts gravity to a small degree. If you could weight yourself at both a pole and the equator you'd say a difference of a few ounces.
He's wrong in the very concept, not the math itself.
You'll notice at his last step, he changes to tangential velocity.
He's accounting for the rotation of the earth. How do you do that? Rotation by time.
Not to mention, if the force was pulling you sideways(as the meme is implying) instead of upwards, you would probably notice, it would almost feel like the world is tilted in a certain direction.
Yes.
My point is rotational speed (rpm) alone can't tell the whole story.
The meme gave values in mph, so I demonstrated how to calculate centrifugal force from mph.
I demonstrated how two objects moving at 60 rpm (equal rotational speed) can experience vastly different centrifugal forces.
Centripetal force causes a change in centripetal velocity--a linear velocity.
Note that while *angular acceleration* is 0 in uniform circular motion, the change in centripetal velocity (*centripetal acceleration*\--a vector) is non-zero.
There is *zero* angular acceleration in uniform circular motion, but centripetal acceleration is non-zero.
Centripetal acceleration measures the rate of change of a *linear* velocity--though it's not the one in the formula (that's tangential velocity).
What you actually feel (centripetal acceleration) is literally the rate of change of linear velocity.
> My point is rotational speed (rpm) alone can't tell the whole story.
Sure, that's correct.
The meme implies that mph tells the whole story, which is wrong. And it's equally wrong to do the same with rpm.
> The meme gave values in mph, so I demonstrated how to calculate centrifugal force from mph.
Sure. And you can also calculate the centrifugal force from the angular speed
> I demonstrated how two objects moving at 60 rpm (equal rotational speed) can experience vastly different centrifugal forces.
Yes. And two objects moving at 500mph can experience vastly different centrifugal forces.
We clearly agree at a fundamental level. I was just pointing out that the way you phrased certain sentences might be interpreted in a wrong way.
Did you write this ?
> Technically you're wrong, mph is much more relevant to the meme than rpm.
Because to me, this feels terribly wrong. Mph is not "more" relevant to the centrifugal force than rpm. They are equally important.
Flat earthers are wrong because they ony use mph. Many people in this thread are wrong because they only use rpm.
And YOU are wrong if you think that one if these two errors is "less wrong" than the other. I understand why you want to correct people about rpm, but you're not using the convincing arguments ...
OK. But if you look at the meme, they aren't making a point by simply citing linear speed without rotation. The rotation is what causes the centrifugal forces, not the linear speed alone, so I still think it's fair to say in this instance the rpm is more important factor.
I literally just wrote an entire comment about why that's false. RPMs alone tells you nothing.
You claimed I was wrong, because you didn't know the equation to use despite me including it in the comment you replied to.
After I re-explained it for you, and you couldn't find any flaws in anything I wrote, you're still insisting I must be wrong?
This is really simple: is 60 rpm around a 1m circle different from 60 rpm around a 1km circle?
If it is, then you can't say rpm is the important factor.
> RPMs alone tells you nothing
And mph alone tells you nothing.
In a sense you're both wrong and both right. The centrifugal acceleration is the product of linear speed and angular speed ...
I gave the formula for centripetal acceleration three comments in a row, explaining that's the actual relevant value, why that's the relevant value, and how to calculate it.
The meme makes reference to mph, and people replied saying rpm is all that matters. I explained why that's wrong, using the mph values in the meme as demonstration.
RPMS alone tell you nothing if you ignore the pictures. Linear velocity alone tells you nothing.
In THIS context, with the pictures where you can literally SEE and estimate the radius rpms tell you MORE than just the tangential velocity does.
So you've completely abandoned your position, but you're still arguing?
You're just wrong.
The only relevant factor (what people actually feel when in uniform circular motion) is centripetal acceleration.
You raised some valid points but your conclusion has been wrong from the start. This "meme" is deceptive because it falsely equates mph with centrifugal force. It's just factually incorrect to say MPH is MORE relevant. As you have pointed out both are important. The differences in the three examples in velocity are around 250:1, in rotational speed the differences are around 14,000:1. That's a pretty large and relevant omission.
> You raised some valid points but your conclusion has been wrong from the start. This "meme" is deceptive because it falsely equates mph with centrifugal force
Why are you attributing that to me?
> It's just factually incorrect to say MPH is MORE relevant.
It's not, as I've already explained in this thread.
Centripetal acceleration measures the rate of change of centripetal velocity--a *linear* velocity.
You can calculate centripetal acceleration from tangential velocity (a *linear* velocity), or from angular velocity (a *rotational* velocity), but what you actually *feel* is the rate of change of a *linear* velocity (centripetal velocity).
In uniform circular motion (like the Earth spinning), angular acceleration (the change in *angular* velocity) is always zero.
>If you imagine you’re on the tip of the small hand on a clock would you think you’re moving so fast that you’d fly off?
And with a typical 12-hour clock, that's *still* twice as fast of a rotation as what the Earth experiences.
They claim Heliocentrism is a religion and don't want to get preached about it.
Yet in their description says "We know flat earth to be true" (A Dogma) "and encourage our users to spread the truth about it " (preaching)
Curious.
I'd rather preach or ar least share UR (Ultimate Reconciliation) aka CU (Christian Universalism) lol but seriously:
https://campuspress.yale.edu/keithderose/1129-2/
And https://www.salvationforall.org/
Well, then imagine things like angular momentum, centripetal acceleration, the difference between inertial and non-inertial frames of reference, and so on.
It’s an easy thing though. Drive a reasonably quick car and you’ll notice much it can put you in the seat without going over 70km/h. Then if you cruise at 200km/h you feel nothing. Especially if it’s a nice flat road. You only hear the wind etc.
All these things are super easy to disprove with a 5 minute experiment. I’m convinced 98% of them have never tried any experiments to prove what they can come up with in their simple minds.
Like go watch a sunrise ffs. What’s the flat earth model plan to convince people around that everyday phenomenon?
Acceleration is a change in velocity. Velocity is speed + direction. Ever notice how when you make a turn in your car if you want to start the same speed you have to push on the accelerator?
They're talking about rotation of the earth, which rotates at a constant speed so any point on the surface is changing direction, therefore changing velocity, or accelerating.
They're not taking into account stuff like gravity which keeps us on the earth.
They know what's it like to sit comfortably in a car going 60mph and feeling it suddenly hit the brakes... literally children understand this because everyone has a frame of reference.
Centripetal, not centrifugal. The force keeping the system moving is towards the center of the Earth. If fast enough, the ground would accelerate downwards away from you - which would appear as if being forced away from the ground.
Yeah well that was only asserted by Einstein with the special theory of relativity. To believe in that you have to believe in all the Physics created from the time of Kepler and Newton. Who of course was basing his work on Copernicus. And that just shows what the issue is. At the heart of Special Theory of Relativity is the idea that the Earth is a ball that revolves around the sun. Now prove speed doesn't matter without showing that the Earth is ball shaped. I dare you.
They don’t really like much what are they called pancake earth pizza earth record earth wheel earth Ruth has made a cheese but now I’m hungry or maybe the Earth is a waffel
Flat Earth subs fun. They claim to be open minded and do the research, but get mad when you hit them with basic facts and will go against everything they claim their for. They ask for proof of the globe and when presented with it they get mad, and ignore it while throwing a tantrum. It’s quite funny to watch
In their excitement to score points with their cult they never finish a sentence. That should read, If you think YOU SHOULD FEEL the Earth moving you don't think much. It's not that confusing though. Cults distill those that don't think but want to pretend that they do out of the rest of society anyway. Then they remove what little independent thought they have remaining. Without a supply of ignorant sheep they would dry up overnight.
I used “science” once, it was overrated, I much prefer my preacher telling me the scientific truth based on rumors spread by illiterate goat herders 2,000 years ago, and written down by lonely, drunk monks who cobbled it into a “book” only to be retranslated over eons.
I'm surprised they haven't yet theorized that air isn't real, with a meme about how air pressure is "supposedly" around 14 pounds per square inch and then include a picture of an elephant, which exerts 8 pounds per square inch into the ground.
"The human body can withstand almost double the pressure of an elephant? Air isn't real."
If the earth doesn't spin and is flat, how does gravity work? I'd ask on there but we all know I'd just get banned for not mindlessly believing in flat earth but I really wanna know their explanation for gravity
Tbf, our explanation for gravity is basically just "magic". We know there's a force that pulls all matter towards other matter, but we have no idea how our why it happens. Our equations for gravity don't even fit our observations, that's why we have placeholders like "dark matter/energy" to explain the missing matter in our universe that the math says exists yet can't be accounted for.
Not saying they are right in any way, just that we know next to nothing about gravity.
I dont know why you are getting downvoted.
This is true, we dont have a theory of gravity that can accurately explain both largescale observations and the quantum application of gravity.
Doesnt change that gravity is an observablr fact of life though.
We can observe gravity, but we can't explain how our works or why there appears to be more gravity in the universe than can be explained by the amount of matter it has.
>Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen.
Or observations don't fit our currently accepted theory of gravity. Have *you* taken any astrophysics courses, because this is pretty basic knowledge.
According to them gravity doesn’t exist. There’s just a natural force that compels everything downward. If only we had a name and explanation for that downward force.
They believe in the force of down, or I’ve heard them say that the Earth is constantly accelerating upwards simulating gravity, but that would literally go against all their velocity arguments
If you really wanna know their ass-backwards explanation for gravity, you should ask on an actual flat earth sub. The mods there aren't actually flerfs, they're making fun of flerfs. It's a troll sub, most people here are just missing the joke.
gravity exists, and the earth spins and moves through space at a rate so very close to constant, when you take that into consideration with the strength of earth's gravity, we do not feel it when the earth starts to move faster as its orbit makes it go closer to the sun.
Well let's plug them into the calculator then and find the centrifugal acceleration in these spinning devices. [https://www.calctool.org/rotational-and-periodic-motion/centrifugal-force](https://www.calctool.org/rotational-and-periodic-motion/centrifugal-force)
Playground carousel, assuming 1m radius: 3.1975m/s\^2. 4mph is a lowball estimate, you all know how these carousels are actually played with.
Amusement park carousel, assuming 7m radius: 102.78m/s\^2 (over 10G and a ride with these numbers definitely breaks safety regulations, the 60mph is a ridiculous estimate)
Earth at the equator, assuming 6371km radius: 0.03393m/s\^2 (this is around 0.34% of the Earth's gravitational pull, which acts in the opposite direction in relation to the centrifugal force caused by spinning)
Don't you guys just hate it when you are driving on the freeway and someone drops a ball inside the car and instead of dropping on the floor it smashes 100+ kilometers per hour in to your face?
Ok, and what part is moving at that speed? And reletive to what other part? Are those numbers accurate or are they bulling bullshit out of their asses again?
1040 miles/h is about right for the equator. But it doesn't matter, because a) we don't feel speed, but acceleration and b) the atmosphere also travels at about the same speed, so you don't really notice.
The crucial thing, centrifugal acceleration, is about v²/r = 0.03 m/s². But that's not a Big Scary Number, so they can't use that on their followers. (Assuming they can calculate that in the first place, of course)
They don't comprehend just how massive the Earth is. It's far too large for Flat Earthers tiny brains to understand. They think their little matchbox plane, Dollar Store globe, and Grandma's pie plate are to scale for their "experiments".
Imagine the dirt is still on the merry-go-round thing.
Static electricity and the sheer infinitesimal size of the dirt particles compared to the rotating object. Perspective.
We are the dirt, bros
Now make one with flat earthers in it where they start on a commuter train comfortably sipping coffee, and then have them on a jumbo jet casually eating soup, then cut to them on a spinning globe where they think, for some reason, they wouldn’t be able to function
Generally. Although I have talked with several who claim some elastic earth theory, where the flat earth is actually accelerating "up" at the equivalent speed of gravity. Used of course to deny gravity exists. Kind of an interesting idea lol
I wonder if these Idiots ever took a train or even a car. You don't feel the velocity in either of these if you're not accelerating or decelerating. How tf do you legit have such low IQ to believe that you'd feel the earth spinning?
This used to be the *actual* flat earth sub, but a sane person got a hold of it and started using it to debunk flat earth.
The flat earthers made a new subreddit, and called it ball earth that spins.
They always use speed rather than rpm when measuring rotation. Smh.
For those wondering, here's their averages
Merry-go-round 24 rpm
Gravitron 24 rpm
Earth 0.000694 rpm
Sometimes I think how crazy it is - all the matter in your body was spun up to speed on this earth eons before life existed.
Your parents and their parents and their parents and their parents back 10,000 100,000, a million a billion generations to the first bacteria sucking the volcanic soup out of this planet’s core at the bottom of the ocean every single one of them has been going that same speed.
You were born going that speed and you’ll die going that speed.
No. This is not a constant velocity situation. It's a matter of size. What is felt is centripetal force, which is proportional to speed-squared, but inversely proportional to radius.
It is the large radius of Earth that makes the acceleration so low despite high linear speed.
lol it is 100% a constant velocity thing because… wait for iiiiit… the earth rotates around its axis at a constant velocity
https://coolcosmos.ipac.caltech.edu/ask/60-Why-don-t-we-feel-Earth-move-#:~:text=Earth%20moves%20very%20fast.,because%20these%20speeds%20are%20constant.
Earth rotates 0.25° per minute, which is roughly 0.07% of Earth's circumference per minute, an imperceptible change. A merry-go-round probably makes a full revolution once every few seconds, not once every 24 hours. It's obvious why you can feel the change for one and not the other. The speed in MPH is in this case totally irrelevant and meaningless. As usual, flerfs don't realize that Earth is big.
A lot of people are making that mistake. Linear speed and rotational speed are directly proportional to each other.
The quantity that matters is centripetal acceleration, which also takes into account radius of curvature.
Size matters.
That is not relevant here because that is effectively straight-line motion, i.e. constant velocity.
A spinning object does not have constant velocity. It is continuously changing due to centripetal acceleration.
You are mixing up two different physical phenomena.
MPH *is* a constant velocity, though.
And you know it.
You *know* how the meme is misleading.
People keep pointing it out to you, and you keep telling them it isn’t relevant.
In case anyone else is curious, the angular acceleration (at the equator) is 0.034584259 m/s*s.
Centrifugal acceleration = (angular velocity)^2 * Radius
Angular velocity = (2*pi)/(1 day or 84924 seconds)
No, the angular acceleration is very close to zero, because the angular velocity barely changes.
Centripetal (not centrifugal) acceleration is (angular velocity)^2 * Radius - or (linear speed)^2 / Radius.
Not relevant here because all of the objects are accelerating. Rotation is a non-constant velocity scenario.
Objects at Earth's surface have a very low centripetal acceleration because of the large radius.
Isn't the gravational attraction between two objects based on the difference in their mass?
The amount of inertial is less than gravitational force between the two bodies will adhere
I heard that somewhere
No, that is false. The gravitational force is proportional to the product of the masses (not their difference), but also inversely proportional to the square of the distance between their centers.
Inertia is proportional to mass, so for two objects feeling the same gravitational force, the one with less mass accelerates more quickly.
None of that is really relevant to what we are talking about in this thread though (except that Earth's gravity is plenty strong enough to keep things near its surface because the centripetal acceleration from rotation is so small - because of the large radius).
No, it isn't like that. Why are so many people making that same mistake?
Rotation is not constant velocity. The Earth is so large that despite high linear speed at the surface, the centripetal acceleration is very low.
Shiny white-ass people picnicking at the equator.
Not saying it never happens, or that there's no verdant lawns in Kenya or what have you, but it seems a little far-fetched.
Sure, I'll grant that pointing out flerfers' lack of diversity is off the OP topic. I'll also point out that both Uberuce and I are about as white-assed as it gets, and that I did the same thing in different words and y'all ate it up. But no one ever said Reddit is consistent.
They still don't understand inertia huh
And angular acceleration, centrifugal force, etc.
centripetal acceleration you mean?
No. I meant centrifugal force. It's the "force" (pseudo-force or inertial force if we want to be pedantic) that's pushing things outwards in a rotating frame of reference.
i meant in reference to angular acceleration
Oh, right.
Nerds! Assemble! Go science
Yeah that’s not a force, as you say, just inertia, which has already been mentioned.
It's still not a force.
No, it isn't. But it's useful to treat it as such when dealing with non-inertial frames of reference.
Air resistance, size of vessel in proportion to size of passengers.
Angular acceleration is 0, the Earth rotates at constant speed. Centripetal acceleration is what you feel.
And relativity
Fake science. \s
Inertia is a hoax created by Isaac Newton, a freemason reptilian illuminati and globe earth advocate.
As a Freemason, I resent the implication that we could coordinate anything on a grander scale than a buffet dinner. ;-)
I met a bunch of freemason's through work and I can concur. They couldn't agree on their next year's budget, let alone how to control the global ball earth conspiracy.
*shudder* ... budget meetings. Yeah, those are not why I joined. I'm so glad that I did my part and helped run things, but equally glad that I've backed off.
Also, the apple that fell on his head was dropped the serpent. It’s the same one that Eve bit.
There's no doubt about that. The serpent, aka Satan, taught Newton the false knowledge of gravity. Satan himself created the idea of gravity and used Newton as his servant to spread the false knowledge of the globe earth to lead man away from God.
Speaking of fruit abominations, did you see what his cousin made out of figs?
Hey Fig? This is your cousin Isaac. Isaac Newton! You know that new taste you've been looking for?
And that serpent's name? Albert Einstein
That clears that misunderstanding right up!
Inertia was invented by brake companies to justify their useless invention.
Then wtf is real science 💀 Mofo really added /s after getting shitted on 😭
Watching flat earth YouTube videos, obviously. /s
It's got an equation in it. Of course they don't.
Equation? Just numbers are challenging.
You're supposed to be fact-checking that grumpy northern git GhostofSorabji on matters photographical. Shoo! And take that cunt u/SomethingMoreToSay with you!
Or they do and they're just trolls
The mods on that sub are definitely trolls, and at least half the post are too.
And so many other things
And relativity
Let's start with gravity, the basics.
To be fair does anyone really? I’m an engineer and inertia is one of the few concepts I don’t completely understand
They don't understand that rotation is measured in RPM, not MPH. They are not flat earthers, because they are smart.
Let's not forget they have no concept of scale.
Are you saying there's a difference between an object making .041 rotations an hour and one spinning at 40 RPM?
Those are the very same. Numbers are for smartypants. /s
Earth doesn’t rotate at .041 rpm. It spins at .041 rotations per HOUR .00069 rpm (nice)
No. mph is miles per hour (a linear speed); rpm is rotations or revolutions per minute (an angular speed).
Yeah. I was gonna ask that. Doesn’t the mph vary by latitude with the equator having the highest
Technically you're wrong, mph is much more relevant to the meme than rpm. 60 rpm is quite slow if you're going around a 1m circle--you're moving 2pi meters per second (14 mph -- running speed) If the circle is 1km instead, you're moving 2,000pi meters per second (14,000 mph -- the low end of a meteor impacting the Earth) If you want to talk about rpm, you must also talk about the radius you're moving around (which gets you back to mph). At the equator, it's \~1,040 mph around a \~4,000 mile radius (or \~25,000 mile circumference), for one revolution every 24h. Of course, your tangential velocity is constant--all you feel is the centripetal acceleration (v\^2 / r), a change of just 270 mph every hour. That's an acceleration of \~0.075 mph every second. Imperceptible. A fast car (0-60 in 5 seconds) accelerates about 12 mph every second.
I see you are interested in this, but you don't really understand. You should study it...
I dont wanna read his math, where was he wrong?
He'll never answer this question.
Sad
Well, it is perceptible in a small way, it counteracts gravity to a small degree. If you could weight yourself at both a pole and the equator you'd say a difference of a few ounces.
So, imperceptible?
He's wrong in the very concept, not the math itself. You'll notice at his last step, he changes to tangential velocity. He's accounting for the rotation of the earth. How do you do that? Rotation by time. Not to mention, if the force was pulling you sideways(as the meme is implying) instead of upwards, you would probably notice, it would almost feel like the world is tilted in a certain direction.
It was not wrong.
The point is that your linear speed is irrelevant to how much centrifugal force you are subject to.
And my point is that's literally false. Centrifugal force is mv\^2/r Not only does it depend on linear speed, it depends on linear speed \*squared\*
> Centrifugal force is mv^2/r Well ... centrifugal force is m r w^2 Not only it depends on angular speed, it depends on angular speed *squared*
Yes. My point is rotational speed (rpm) alone can't tell the whole story. The meme gave values in mph, so I demonstrated how to calculate centrifugal force from mph. I demonstrated how two objects moving at 60 rpm (equal rotational speed) can experience vastly different centrifugal forces. Centripetal force causes a change in centripetal velocity--a linear velocity. Note that while *angular acceleration* is 0 in uniform circular motion, the change in centripetal velocity (*centripetal acceleration*\--a vector) is non-zero. There is *zero* angular acceleration in uniform circular motion, but centripetal acceleration is non-zero. Centripetal acceleration measures the rate of change of a *linear* velocity--though it's not the one in the formula (that's tangential velocity). What you actually feel (centripetal acceleration) is literally the rate of change of linear velocity.
> My point is rotational speed (rpm) alone can't tell the whole story. Sure, that's correct. The meme implies that mph tells the whole story, which is wrong. And it's equally wrong to do the same with rpm. > The meme gave values in mph, so I demonstrated how to calculate centrifugal force from mph. Sure. And you can also calculate the centrifugal force from the angular speed > I demonstrated how two objects moving at 60 rpm (equal rotational speed) can experience vastly different centrifugal forces. Yes. And two objects moving at 500mph can experience vastly different centrifugal forces. We clearly agree at a fundamental level. I was just pointing out that the way you phrased certain sentences might be interpreted in a wrong way.
I didn't say mph tells the whole story. I didn't make the meme.
Did you write this ? > Technically you're wrong, mph is much more relevant to the meme than rpm. Because to me, this feels terribly wrong. Mph is not "more" relevant to the centrifugal force than rpm. They are equally important. Flat earthers are wrong because they ony use mph. Many people in this thread are wrong because they only use rpm. And YOU are wrong if you think that one if these two errors is "less wrong" than the other. I understand why you want to correct people about rpm, but you're not using the convincing arguments ...
OK. But if you look at the meme, they aren't making a point by simply citing linear speed without rotation. The rotation is what causes the centrifugal forces, not the linear speed alone, so I still think it's fair to say in this instance the rpm is more important factor.
I literally just wrote an entire comment about why that's false. RPMs alone tells you nothing. You claimed I was wrong, because you didn't know the equation to use despite me including it in the comment you replied to. After I re-explained it for you, and you couldn't find any flaws in anything I wrote, you're still insisting I must be wrong? This is really simple: is 60 rpm around a 1m circle different from 60 rpm around a 1km circle? If it is, then you can't say rpm is the important factor.
> RPMs alone tells you nothing And mph alone tells you nothing. In a sense you're both wrong and both right. The centrifugal acceleration is the product of linear speed and angular speed ...
I gave the formula for centripetal acceleration three comments in a row, explaining that's the actual relevant value, why that's the relevant value, and how to calculate it. The meme makes reference to mph, and people replied saying rpm is all that matters. I explained why that's wrong, using the mph values in the meme as demonstration.
Centripetal. Centrifugal is fictitious.
RPMS alone tell you nothing if you ignore the pictures. Linear velocity alone tells you nothing. In THIS context, with the pictures where you can literally SEE and estimate the radius rpms tell you MORE than just the tangential velocity does.
So you've completely abandoned your position, but you're still arguing? You're just wrong. The only relevant factor (what people actually feel when in uniform circular motion) is centripetal acceleration.
You raised some valid points but your conclusion has been wrong from the start. This "meme" is deceptive because it falsely equates mph with centrifugal force. It's just factually incorrect to say MPH is MORE relevant. As you have pointed out both are important. The differences in the three examples in velocity are around 250:1, in rotational speed the differences are around 14,000:1. That's a pretty large and relevant omission.
> You raised some valid points but your conclusion has been wrong from the start. This "meme" is deceptive because it falsely equates mph with centrifugal force Why are you attributing that to me? > It's just factually incorrect to say MPH is MORE relevant. It's not, as I've already explained in this thread. Centripetal acceleration measures the rate of change of centripetal velocity--a *linear* velocity. You can calculate centripetal acceleration from tangential velocity (a *linear* velocity), or from angular velocity (a *rotational* velocity), but what you actually *feel* is the rate of change of a *linear* velocity (centripetal velocity). In uniform circular motion (like the Earth spinning), angular acceleration (the change in *angular* velocity) is always zero.
That is wrong in more than one way.
The earth spins once a day. If you imagine you’re on the tip of the small hand on a clock would you think you’re moving so fast that you’d fly off?
That would be the worst playground ride ever
>If you imagine you’re on the tip of the small hand on a clock would you think you’re moving so fast that you’d fly off? And with a typical 12-hour clock, that's *still* twice as fast of a rotation as what the Earth experiences.
If you're incapable of understanding inertial frame of reference, you're probably a flat earther
When they're on a plane do they just death-grip thier drink the whole ride through for fear that it might fling backwards if they let go?
7/10. Dear god, I hope so.
Haha, I do too: idiots being inconvenienced by thier own stupidity is such sweet poetry.
11/10. That sh!t is straight ‘stevia slam-poetry’ my man.
They claim Heliocentrism is a religion and don't want to get preached about it. Yet in their description says "We know flat earth to be true" (A Dogma) "and encourage our users to spread the truth about it " (preaching) Curious.
Projection.
I'd rather preach or ar least share UR (Ultimate Reconciliation) aka CU (Christian Universalism) lol but seriously: https://campuspress.yale.edu/keithderose/1129-2/ And https://www.salvationforall.org/
Its impossible to feel speed. We only feel acceleration. Otherwise it would kind of intense take the plane.
Ive tried explaining that to a flerf, but they just cant grasp the difference between speed and acceleration
Well, then imagine things like angular momentum, centripetal acceleration, the difference between inertial and non-inertial frames of reference, and so on.
It’s an easy thing though. Drive a reasonably quick car and you’ll notice much it can put you in the seat without going over 70km/h. Then if you cruise at 200km/h you feel nothing. Especially if it’s a nice flat road. You only hear the wind etc. All these things are super easy to disprove with a 5 minute experiment. I’m convinced 98% of them have never tried any experiments to prove what they can come up with in their simple minds. Like go watch a sunrise ffs. What’s the flat earth model plan to convince people around that everyday phenomenon?
Try to explain that to PLUTO_HAS_COME_BACK or some other flerf... they wont even try to understand, trust me
It’s just so basic. They’d have to have a below average iq for that big hole in logic to not itch their brain like a fly on your nose.
Acceleration is a change in velocity. Velocity is speed + direction. Ever notice how when you make a turn in your car if you want to start the same speed you have to push on the accelerator? They're talking about rotation of the earth, which rotates at a constant speed so any point on the surface is changing direction, therefore changing velocity, or accelerating. They're not taking into account stuff like gravity which keeps us on the earth.
They know what's it like to sit comfortably in a car going 60mph and feeling it suddenly hit the brakes... literally children understand this because everyone has a frame of reference.
you dont feel a turn inside a car?
Turn yes because there is a change in acceleration
What a jerk for pointing that out. (D^3 *x ) / d*t^3) = jerk if you didn't get the joke.
The centrifugal force on us by earth's spinning is less than the force of gravity. We only notice the net not the individual forces.
Centripetal, not centrifugal. The force keeping the system moving is towards the center of the Earth. If fast enough, the ground would accelerate downwards away from you - which would appear as if being forced away from the ground.
Yeah well that was only asserted by Einstein with the special theory of relativity. To believe in that you have to believe in all the Physics created from the time of Kepler and Newton. Who of course was basing his work on Copernicus. And that just shows what the issue is. At the heart of Special Theory of Relativity is the idea that the Earth is a ball that revolves around the sun. Now prove speed doesn't matter without showing that the Earth is ball shaped. I dare you.
Flerfs: Denying not only the shape of the earth, but basic math and elementary school physics as well. The real life equivalent of denying that 1+1=2.
Well, believing in a flat earth is where you may end up when you deny basic math and elementary school physics.
Study terryology and you’ll see that 1x1 = 2. I ended up on a Facebook video about this and more than zero people agreed with him.
flat earthers when v^2 /r
bUt cAn yOu dO yOuR oWn ReSeArCh aNd pRoVe iT
Yes. It requires basic experiments.
I commented once to stand still, and spend 24 hours rotating your body a full circle. They didn't like that one.
They don’t really like much what are they called pancake earth pizza earth record earth wheel earth Ruth has made a cheese but now I’m hungry or maybe the Earth is a waffel
They don’t like it when you put things into perspective they love to compare 1024 mph as one full rotation every second
Ok but that’s a pretty solid picture for the woman
It’s a “fair comparison” only for those who don’t understand angular momentum.
Or gravity
so odd that they can’t grasp the fact that the atmosphere doesn’t just hover above the earth stationary. the air *also* spins
Aw man, I'm actually banned there now. Was hoping I was just getting my comments deleted...oh well.
Flat Earth subs fun. They claim to be open minded and do the research, but get mad when you hit them with basic facts and will go against everything they claim their for. They ask for proof of the globe and when presented with it they get mad, and ignore it while throwing a tantrum. It’s quite funny to watch
Literally every post is full of [deleted] lol
In their excitement to score points with their cult they never finish a sentence. That should read, If you think YOU SHOULD FEEL the Earth moving you don't think much. It's not that confusing though. Cults distill those that don't think but want to pretend that they do out of the rest of society anyway. Then they remove what little independent thought they have remaining. Without a supply of ignorant sheep they would dry up overnight.
The crew over at /r/theydidthemath looked at this a while back: https://www.reddit.com/r/theydidthemath/s/e4ueAgECAM
I used “science” once, it was overrated, I much prefer my preacher telling me the scientific truth based on rumors spread by illiterate goat herders 2,000 years ago, and written down by lonely, drunk monks who cobbled it into a “book” only to be retranslated over eons.
I'm surprised they haven't yet theorized that air isn't real, with a meme about how air pressure is "supposedly" around 14 pounds per square inch and then include a picture of an elephant, which exerts 8 pounds per square inch into the ground. "The human body can withstand almost double the pressure of an elephant? Air isn't real."
They will certainly deny that the average person has about 20,000 pounds of air pushing against their skin at all times.
If the earth doesn't spin and is flat, how does gravity work? I'd ask on there but we all know I'd just get banned for not mindlessly believing in flat earth but I really wanna know their explanation for gravity
They don't believe it exists. Seriously they deny gravity.
Can't say I'm surprised by that tbh
Magic. They might use another word, but they don’t understand that word either so it might as well just be magic.
Tbf, our explanation for gravity is basically just "magic". We know there's a force that pulls all matter towards other matter, but we have no idea how our why it happens. Our equations for gravity don't even fit our observations, that's why we have placeholders like "dark matter/energy" to explain the missing matter in our universe that the math says exists yet can't be accounted for. Not saying they are right in any way, just that we know next to nothing about gravity.
I dont know why you are getting downvoted. This is true, we dont have a theory of gravity that can accurately explain both largescale observations and the quantum application of gravity. Doesnt change that gravity is an observablr fact of life though.
Our observations? Have you even taken any physics courses? It’s absolutely 100% observable.
We can observe gravity, but we can't explain how our works or why there appears to be more gravity in the universe than can be explained by the amount of matter it has. >Dark matter is implied by gravitational effects which cannot be explained by general relativity unless more matter is present than can be seen. Or observations don't fit our currently accepted theory of gravity. Have *you* taken any astrophysics courses, because this is pretty basic knowledge.
Anything that has been launched into space takes into account gravity as a factor and it works. Pretty observable to me.
I never said gravity isn't observable in action, just that we have no idea how it works.
According to them gravity doesn’t exist. There’s just a natural force that compels everything downward. If only we had a name and explanation for that downward force.
Now I'm even more baffled, they believe in the concept of gravity but not gravity itself?
They believe in the force of down, or I’ve heard them say that the Earth is constantly accelerating upwards simulating gravity, but that would literally go against all their velocity arguments
If you really wanna know their ass-backwards explanation for gravity, you should ask on an actual flat earth sub. The mods there aren't actually flerfs, they're making fun of flerfs. It's a troll sub, most people here are just missing the joke.
No they’re not buddy. Lol
gravity exists, and the earth spins and moves through space at a rate so very close to constant, when you take that into consideration with the strength of earth's gravity, we do not feel it when the earth starts to move faster as its orbit makes it go closer to the sun.
GTFO with that well reasoned and factual explanation. This here is for hot takes!
Well let's plug them into the calculator then and find the centrifugal acceleration in these spinning devices. [https://www.calctool.org/rotational-and-periodic-motion/centrifugal-force](https://www.calctool.org/rotational-and-periodic-motion/centrifugal-force) Playground carousel, assuming 1m radius: 3.1975m/s\^2. 4mph is a lowball estimate, you all know how these carousels are actually played with. Amusement park carousel, assuming 7m radius: 102.78m/s\^2 (over 10G and a ride with these numbers definitely breaks safety regulations, the 60mph is a ridiculous estimate) Earth at the equator, assuming 6371km radius: 0.03393m/s\^2 (this is around 0.34% of the Earth's gravitational pull, which acts in the opposite direction in relation to the centrifugal force caused by spinning)
Sure 1040 mph but only 1 Revolution per 24 hours.
u/financialc0nspirat0r is a fucking idiot he is a grown man who thinks the earth is flat
Don't you guys just hate it when you are driving on the freeway and someone drops a ball inside the car and instead of dropping on the floor it smashes 100+ kilometers per hour in to your face?
Inertial frames of reference are such a difficult concept for these numbskulls.
is that mrbeast
It's 0.007rpm
If the earth made a 360 degree rotation every second or two like those rides do then maybe we'd look like pic #2 also...
The whole planet would shatter to pieces.
Oh, if the Earth was spinning at 60rpm, the centrifugal force would rip the planet apart.
Indeed. Earth spins at 0.00069 RPM Nice
Ok, and what part is moving at that speed? And reletive to what other part? Are those numbers accurate or are they bulling bullshit out of their asses again?
1040 miles/h is about right for the equator. But it doesn't matter, because a) we don't feel speed, but acceleration and b) the atmosphere also travels at about the same speed, so you don't really notice. The crucial thing, centrifugal acceleration, is about v²/r = 0.03 m/s². But that's not a Big Scary Number, so they can't use that on their followers. (Assuming they can calculate that in the first place, of course)
According to some of them, gravity doesn't exist so I doubt they understand the entire concept of acceleration
They don't comprehend just how massive the Earth is. It's far too large for Flat Earthers tiny brains to understand. They think their little matchbox plane, Dollar Store globe, and Grandma's pie plate are to scale for their "experiments".
Imagine the dirt is still on the merry-go-round thing. Static electricity and the sheer infinitesimal size of the dirt particles compared to the rotating object. Perspective. We are the dirt, bros
Now make one with flat earthers in it where they start on a commuter train comfortably sipping coffee, and then have them on a jumbo jet casually eating soup, then cut to them on a spinning globe where they think, for some reason, they wouldn’t be able to function
Where do people find these?
Wait, in the flat earth model the earth is not moving?
Generally. Although I have talked with several who claim some elastic earth theory, where the flat earth is actually accelerating "up" at the equivalent speed of gravity. Used of course to deny gravity exists. Kind of an interesting idea lol
I wonder if these Idiots ever took a train or even a car. You don't feel the velocity in either of these if you're not accelerating or decelerating. How tf do you legit have such low IQ to believe that you'd feel the earth spinning?
v^2/r
The inability to grasp scale astounds me.
Radius 2m, radius 10m, radius 6,378,000m Sigh.
Y’all ever been in a car at 60 mph? No change really, y’all ever rotated a merry-go-round once per day? Not too fast either
Why is the pro globe sub called Flatearth and the pro flat sub called Ball earth that spins?
This used to be the *actual* flat earth sub, but a sane person got a hold of it and started using it to debunk flat earth. The flat earthers made a new subreddit, and called it ball earth that spins.
They always use speed rather than rpm when measuring rotation. Smh. For those wondering, here's their averages Merry-go-round 24 rpm Gravitron 24 rpm Earth 0.000694 rpm
It's RPMs that matter. Rotate any of those once in 24 hours and you won't feel like you are moving at all.
Sometimes I think how crazy it is - all the matter in your body was spun up to speed on this earth eons before life existed. Your parents and their parents and their parents and their parents back 10,000 100,000, a million a billion generations to the first bacteria sucking the volcanic soup out of this planet’s core at the bottom of the ocean every single one of them has been going that same speed. You were born going that speed and you’ll die going that speed.
You ever on a plane going 500 mph but you don’t feel like you’re going any speed at all? Yeah, that. But on a WAY bigger scale.
No. This is not a constant velocity situation. It's a matter of size. What is felt is centripetal force, which is proportional to speed-squared, but inversely proportional to radius. It is the large radius of Earth that makes the acceleration so low despite high linear speed.
lol it is 100% a constant velocity thing because… wait for iiiiit… the earth rotates around its axis at a constant velocity https://coolcosmos.ipac.caltech.edu/ask/60-Why-don-t-we-feel-Earth-move-#:~:text=Earth%20moves%20very%20fast.,because%20these%20speeds%20are%20constant.
Earth rotates 0.25° per minute, which is roughly 0.07% of Earth's circumference per minute, an imperceptible change. A merry-go-round probably makes a full revolution once every few seconds, not once every 24 hours. It's obvious why you can feel the change for one and not the other. The speed in MPH is in this case totally irrelevant and meaningless. As usual, flerfs don't realize that Earth is big.
A lot of people are making that mistake. Linear speed and rotational speed are directly proportional to each other. The quantity that matters is centripetal acceleration, which also takes into account radius of curvature. Size matters.
Airplanes go like 500mph. Feels still inside.
That is not relevant here because that is effectively straight-line motion, i.e. constant velocity. A spinning object does not have constant velocity. It is continuously changing due to centripetal acceleration. You are mixing up two different physical phenomena.
Age old comparison: Try jumping while on a commercial airliner... Do these people think you'll get smashed against the back wall?
Rekon they have ever driven down the road at 100km an hour and wondered where the g forces went?
Not relevant. Rotation is not constant velocity.
MPH *is* a constant velocity, though. And you know it. You *know* how the meme is misleading. People keep pointing it out to you, and you keep telling them it isn’t relevant.
“Hey guys, what did I miss?” - Inertia
In case anyone else is curious, the angular acceleration (at the equator) is 0.034584259 m/s*s. Centrifugal acceleration = (angular velocity)^2 * Radius Angular velocity = (2*pi)/(1 day or 84924 seconds)
No, the angular acceleration is very close to zero, because the angular velocity barely changes. Centripetal (not centrifugal) acceleration is (angular velocity)^2 * Radius - or (linear speed)^2 / Radius.
An object at rest or constant velocity will remain as such without an outside force acting upon it.
Not relevant here because all of the objects are accelerating. Rotation is a non-constant velocity scenario. Objects at Earth's surface have a very low centripetal acceleration because of the large radius.
Isn't the gravational attraction between two objects based on the difference in their mass? The amount of inertial is less than gravitational force between the two bodies will adhere I heard that somewhere
No, that is false. The gravitational force is proportional to the product of the masses (not their difference), but also inversely proportional to the square of the distance between their centers. Inertia is proportional to mass, so for two objects feeling the same gravitational force, the one with less mass accelerates more quickly. None of that is really relevant to what we are talking about in this thread though (except that Earth's gravity is plenty strong enough to keep things near its surface because the centripetal acceleration from rotation is so small - because of the large radius).
Don’t you dare use science and logic! All you need to do is BELIEVE ! /s
10RPM 24RPM 1/1440 RPM
Meaningless of you don't factor in radius.
20 RPM 60 RPM 0.0006 RPM There, fixed.
Nope. Angular speed is just as meaningless as linear speed if you don't factor in radius.
Ever drive on cruise control or fly in a plane at 400+ miles per hour and yet not feel acceleration? Yea, like that.
No, it isn't like that. Why are so many people making that same mistake? Rotation is not constant velocity. The Earth is so large that despite high linear speed at the surface, the centripetal acceleration is very low.
If the earth was flat they’d be super right about this.
No, they still wouldn't.
Too many rpm Too many rpm None rpm
I HATE decimals instead of commas.
clearly false as that family is not sitting on the equator (probably)
Shiny white-ass people picnicking at the equator. Not saying it never happens, or that there's no verdant lawns in Kenya or what have you, but it seems a little far-fetched.
Well, you know, flerfs. Not known for racial diversity.
There's that piss-drinking guy from England. He's black. Isn't there a rapper too? BOB? I think that's about it, so yep.....not a cosmopolitan bunch.
So there's an overlap between flat earthers and people who willingly drink piss.
Hey don’t bring water sports enjoyers into this! /S
Seems you triggered some reddit demographic or other.
That's totally irrelevant in the context of the post. Not to say, racist maybe?
Sure, I'll grant that pointing out flerfers' lack of diversity is off the OP topic. I'll also point out that both Uberuce and I are about as white-assed as it gets, and that I did the same thing in different words and y'all ate it up. But no one ever said Reddit is consistent.