What happens to the force between two bodies, if
(i) the mass of one body is doubled?
(ii) the distance between the bodies is doubled and tripled?
(iii) the masses of both bodies are doubled?

What is the importance of universal law of gravitation?

If the moon attracts the earth, why does the earth not move towards the moon?

What is the acceleration of free fall?

The earth and the moon are attracted to each other by gravitational force. Does the earth attract the moon, with a force that is greater, or smaller, or the same as the force with which the moon attracts the earth ? Why?