Posted by kelle on Monday, April 19, 2010 at 4:35pm.
For the first part of your post, try here:
http://search.yahoo.com/search?fr=mcafee&p=how+earth%27s+gravity+effects+you+in+space
And for the 2nd part, here:
http://search.yahoo.com/search?fr=mcafee&p=at+what+altitude+does+Earth%27s+gravity+have+no+effect
Sra
The force of earth's gravity on you is proportional to 1/distance^2
Therefore it never,ever, goes away. It just gets smaller and smaller.
If you go 1 earth radius up, you will be twice as far from earth center as you are here and it will be mg/4
If you get 5 earth radii from earth center it will be mg/25
10 radii is mg/100
100 radii is mg/10,000
What really matters is what happens when you get near something else massive, like Mars. Then the force of Mars gravity would be millions of times the tiny remaining earth gravity and you could do all your Mars landing computations ignoring earth gravity.
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