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Author Topic:   What Creates Gravity?
Perdition
Member (Idle past 3267 days)
Posts: 1593
From: Wisconsin
Joined: 05-15-2003


Message 83 of 84 (513911)
07-02-2009 12:25 PM
Reply to: Message 82 by Purpledbear
07-01-2009 7:36 PM


Re: Holy Crap
Or I am misunderstanding. I thought you implied "Gravity is the pressure which is felt because an object is rolling towards a heavier one at the bottom of a decline". The earth is not rolling top over bottom obviously. North stays N and S stays south, correct? So rather than rolling perhaps better described as a skiier on a slope? I assume this non rolling has to do with spinning on the Axis. OK OK here is my confusion. If the earth is moving into the suns curve why does this wave formed by this pressure, press or hold me down? Pending where the earth was in orbit shouldn't it on occasion pull me forward on my face or back on my ass. I just jumped out the window of my home. I fell straight down I think. But the earth is moving down a slope on an angel. Why did I fall straight down? Why is it always perceived as "pulling down" or "pressing down".
You're taking the analogy too literally. The objects aren't really rolling, per se, they're just moving toward the lowest potential energy point. When you raise something above a massive object, it has potential energy, and as it falls, it uses that potential energy and comes to rest at a place of lower energy and becomes trapped there until more energy is imparted.
You fall straight down because you're falling down the potential energy well that the earth creates. Anything with mass bends space-time, even you and me. We're just so small, and gravity is such a weak force, that it's effectively negligible. The Earth, moon, sun, etc are all so amazingly huge that they have a noticeable effect on things around them.
So, the Earth is revolving around the dip the sun makes. The Moon is revolving around the dip the earth makes, and we're stuck down at the bottom of that dip, unable to get out unless we use a lot of energy to overcome it.

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 Message 82 by Purpledbear, posted 07-01-2009 7:36 PM Purpledbear has not replied

  
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