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).

Gravitational force acts on all objects in proportion to their masses. Why then, a heavy object does not fall faster than a light object ?

How does the force of gravitation between two objects change when the distance between then is reduced to half ?

You have a bag of cotton and an iron bar, each indicating a mass of 100 kg when measured on a weighing machine. In reality, one is heavier than the other. Can you say which one is heavier and why?

You find your mass to be 42 kg on a weighing machine. Is your mass more or less than 42 kg?

Why does an object float or sink when placed on the surface of water?