1. How does force of attraction between two objects change when the distance between them is reduced to half?
2. What happens to the force between the two objects, if
(i) The mass of one object is doubled?
(ii) The distance between the objects is doubled.
3. Calculate the force of gravitation between the earth and the sun, given that the mass of the earth = 6x1024 kg and of the sun = 2x1030 kg. The average distance between the two is 1.5 x 1011 m.