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Offline Earthisround

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Jumping
« on: February 03, 2016, 04:33:22 PM »
If the earth is constantly accelerating in the direction we perceive as up, how is it that I'm able to jump? No human can jump with the amount of force to be able to go faster than the earths supposed movement speed, so how is it that we're able to do it? Wouldn't the earth just ram back into us, kind of like jumping up on a fast elevator moving up.
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Offline juner

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Re: Jumping
« Reply #1 on: February 03, 2016, 04:45:12 PM »
Quote from: Earthisround on February 03, 2016, 04:33:22 PM
If the earth is constantly accelerating in the direction we perceive as up, how is it that I'm able to jump? No human can jump with the amount of force to be able to go faster than the earths supposed movement speed, so how is it that we're able to do it? Wouldn't the earth just ram back into us, kind of like jumping up on a fast elevator moving up.

I would suggest that you review the Equivalence Principle. The effects of gravity are not distinguishable from acceleration. Your statement is literally like saying I cannot jump because of gravity.
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Offline Pongo

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Re: Jumping
« Reply #2 on: February 03, 2016, 04:46:52 PM »
Yes, the earth rams back into us at 32 feet/second^2.

Offline andruszkow

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Re: Jumping
« Reply #3 on: February 03, 2016, 08:26:59 PM »
Hmm. But the laws of physics says that a moving object will keep moving until a force acts upon it that makes it slow down, stop or change direction.

That makes jumping entirely possible, no matter if we're considering gravity or UA.

What force is slowing my jump down equal to the force of my jump so that the earth approaches me at 9.8m/s^2 if we're considering UA though? And what mechanism makes this opposite force uniform no matter how much force I put into my jump?
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Offline andruszkow

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Re: Jumping
« Reply #4 on: February 03, 2016, 08:34:36 PM »
Sorry, Disregard that, I forgot that according to UA, earth is accelerating, not at a fixed speed.
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Offline Shane

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Re: Jumping
« Reply #5 on: February 12, 2016, 08:49:42 PM »
Like has been already said:

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the equivalence principle is any of several related concepts dealing with the equivalence of gravitational and inertial mass, and to Albert Einstein's observation that the gravitational "force" as experienced locally while standing on a massive body (such as the Earth) is actually the same as the pseudo-force experienced by an observer in a non-inertial (accelerated) frame of reference.

https://en.wikipedia.org/wiki/Equivalence_principle
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