what happens to the gravitational force between two objects if
i) the mass of one object is doubled
ii) distance between two objects is doubled
iii) masses of both the objects are doubled
F = Gm1m2/r2
Suppose m1 becomes 2m1:
F/ = G(2m1)m2/r2
=> F/ = 2F
Thus, force is also doubled.
Suppose r becomes 2r.
F// = Gm1m2/(2r)2
=> F// = F/4
Thus, force becomes one-fourth of original value.
Suppose both m1 and m2 are doubled:
F/// = G(2m1)(2m2)/r2
=> F/// = 4F
Thus, force becomes four times the original value.