Universal Law of Gravitation
Posted: December 14th, 2011, 9:10 amThe size of this force depends on:
1. the masses of the two objects
2. the distance between the objects
where G = 6.673 × 10–11 
r = distance between the centers of two objects
this is the gravitational force between ANY two objects
F[sub]g[/sub] = ma[sub]g[/sub] is used only to find the gravitational force between the earth an object on the earth's surface specifically.
However you can use F[sub]G[/sub] to find the gravitational force of an object on the earth's surface.
← this will get you around 9.8 m/s²
1. the masses of the two objects
2. the distance between the objects
r = distance between the centers of two objects
this is the gravitational force between ANY two objects
F[sub]g[/sub] = ma[sub]g[/sub] is used only to find the gravitational force between the earth an object on the earth's surface specifically.
However you can use F[sub]G[/sub] to find the gravitational force of an object on the earth's surface.