Learn more physics!
the strength of the pull of gravity depends on what?
- jewell flanery
The force between two objects having mass is F = -GM1
where G is Newton's constant, the M's are the masses of the objects, and r is the distance between them. This law has been verified at all scales from microscopic to astronomic dimensions. You can determine G from experiment but there is no way to derive its value from any theoretical basis.
All you can say is "What you sees is what you gets".
(published on 01/11/09)
Follow-up on this answer.