Yes that's right, I'm taking the side of the flat earther.

Let me preface this by saying that the fat earth theory is blatantly ridiculous.

However, just because your opponent doesn't know what he's talking about, doesn't mean that you do.

full thread: https://np.reddit.com/r/flatearthsociety/comments/5cotsv/gravity_does_not_exist/d9yl0ur/

(Note that the flat earth model here is an earth that's uniformly accelerating at 9.8 m/s² forever)

Do the math. It takes about a year to get to light speed. That's a prediction your model makes. It is a hallmark of science that models make predictions. If the predictions are confirmed, the model can become an accepted theory. However, the fact that the earth moon system would, within a year, begin to approach the speed of light, with all the relativistic implications of that falsifies the model.

Nope, uniform acceleration is perfectly possible for as long as you want. While an observer in an inertial reference frame will watch you slowly approach the speed of light and never reach it, to a person uniformly accelerating, the acceleration remains, well, uniform.

Then you just debunked the entire premise. Vf=Vo+at. figure you start from stationary. so Vf=at. 60 seconds in a minute60 minutes in an hour24 hours in a day*365.25 (for leap years) days in a year = 31,557,600 seconds in a year. 9.8 m/s2 * 31,557,600 seconds in a year gives me a final velocity of 309,264,480 m/s. Which is a problem since the speed of light is only 299,792,458...

Those formula's don't work in SR/GR because both a,t,Vf and Vo are different depending on the reference frame, so you can't just blindly apply them.

Just think about this for a second. say you are going 1 m/s under the speed of light. You then accelerate at 9.8 m/s. whaT happens? edit. it is the famous you are 10 ft from a wall and every step takes you half the remaining distance to it. do you ever touch the wall. The answer is no.

In the reference frame where you're moving at the speed of light, you of course can't accelerate at 9.8 m/s². In the uniformly accelerating reference frame/ inertial reference frame where you set the speed of the uniformly accelerating object at 0 for some time t=t_0, then yes, you can perfectly accelerate at 9.8 m/s².

So we have been accelerating at a super quadratically increasing energy demand for 4.5 billion years?

No, the energy demands remain the same.