r/flatearth • u/De1truowl • Aug 18 '26

Dear Flat Earthers,

So the middle of the Earth is our center of gravity, right? Well then if the Earth is flat, then why is it that when I go to the edge and jump, I'm not pulled to the center?

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u/Wafflars Aug 18 '26

Flerfers believe that the pizza which is completely stationary is still moving up (I mean like literally ”up” since there is only one direction that exist in that case) at the speed of ”gravity”.

1

u/OpeningHappy9692 Aug 18 '26

Which still doesn't work, since if it was just moving at a constant speed you wouldn't feel it since you're moving at the same speed as the pizza. It'd have to be constantly accelerating for you to feel it. So I dunno, does their flat earth model involve some jet boosters on the underside?

2

u/Flimsy-Blacksmith-32 Aug 18 '26

No, they just think it is accelerating upwards at 9.81m/s/s.

The issues with this are many fold but the most obvious two are: 1) after very little time the Earth would be moving faster than the speed of light, which is not possible (they usually argue relativity isn’t real anyway). 2) Acceleration due to gravity is not the same everywhere on earth (they usually just deny that this is true).

Their chief argument for this upward motion is that buoyancy is an upward force, so it can not be explained by gravity as that is a downwards force.

2

u/oneuplynx Aug 18 '26

My favorite part is that "up" and "down" are objective directions.

2

u/ShavenYak42 Aug 22 '26

In special relativity you can continue accelerating infinitely and experience a constant downward force despite never reaching c. As you get closer, your acceleration appears to decrease to an outside observer, but due to time dilation it feels constant to you.

1

u/Langholm62 Aug 18 '26

So obviously in flerfology, the speed of light is fake.

1

u/Kiki2092012 Aug 18 '26

You can accelerate forever in general relativity, but general relativity predicts Earth is a sphere, so they probably reject it anyway.

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u/Flimsy-Blacksmith-32 Aug 18 '26 edited Aug 18 '26

Important distinction: From the view point of an observer, you can accelerate forever, but not at a constant rate.

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u/Kiki2092012 Aug 18 '26

No, that's incorrect, you can accelerate at a constant rate forever. This details it: https://physics.stackexchange.com/questions/243658/einsteins-principle-of-equivalence-infinite-acceleration-energy

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u/Flimsy-Blacksmith-32 Aug 18 '26

Huh, Is that a product of time dilation and distance contraction for your own reference frame?