Question

The gravitational force between two objects:

is always the same
will decrease if either object gains mass
will increase if the objects are moved closer together

Answer 1

The gravitational force between two objects INcreases

if either object gains mass , and also increases if the objects

are moved closer together.

Unlike the electrostatic force between charges, the gravitational

force between masses ALWAYS pulls them together, and never

pushes them apart.

Answer 2

C. Gravitational force between two objects of masses m1/m2

is defined by Gm1xm2/r^2, where G is a universal constant, and r is the distance between the masses. This shows you why B is wrong; it would increase. Also, A is not a good choice, as shown. In the case of B, it would increase by say, 2/1 to 4/1 by doubling ones mass. In C's case the bottom would decrease on the fraction alot (square) if they were moved closer, thus the force would be greater.