What is the acceleration of free fall ?

What is the importance of universal law of gravitation?

What happens to the force between two objects, if (i) The mass of one object is doubled. (ii) The distance between the objects is doubled and tripled. (iii) The masses of both objects are doubled.

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

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 ?

What is the magnitude of the gravitational force between the earth and a 1 kg object on its surface? (mass of the earth is 6 × 1024 kg and radius of the earth is 6.4 × 106m).