Why the gravitational force between the Earth and the Sun is so great while the same force between two small objects is negligible?

Discuss the forces which depend on the type on the type of interaction.

A mass M is broken into two parts, on & (M-m). How is m related to M so that the gravitational force between two parts is maximum?

Draw graphs showing the variation of acceleration due to gravity with
(i) height above the earth's surface
(ii) depth below the earth's surface.

Find the period of oscillation of a simple pendulum of length \(\alpha\) suspended from the roof a vehicle which moves without friction down an inclined plane of inclination \(\alpha.\)