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 Be the first pioneers to continue the Astronomy Discussions at our new Astronomy meeting place...The Space and Astronomy Agora Re: Re: Re: Re: Re: Gravity Doesn't Exist? Forum List | Follow Ups | Post Message | Back to Thread Topics | In Response ToPosted by Alexander on January 25, 2001 20:29:35 UTC

Hey, guys, Richard is right, acceleration of free fall on the Moon is different than on Earth, but the G is constant.

Proof of different g: weight gravitational attraction between two masses M and ,is given by F=GMm/R^2 Newton's inverse square law of universal gravity, therefore the acceleration of free fall is g=a=F/m=GM/R^2, so for the Earth (if you plug mass and size of Earth) it is one number (10 m/s^2), but for Moon with its own M and R it is different value (about 1.6 m/s^2).

G above is universal gravitational constant - the srength of gravitational interaction (about 6.7x 10^-11 in SI) and is the same for ALL matter around and far from us (that is why it is called constant).