CBSE Class 9 Answered

Gravitation is a natural phenomenon in which each particle of universe attracts the other particle.The force of attraction between particles is due to their masses, and this force of attraction is called the gravitational force of attraction.If the masses of the objects are small, then the gravitational force between them is very small.eg : two stones lying on ground attracts each other but as the masses are small the gravitational force of attraction between them is small and hence its not that prominently visible.

According to Newton, the force of attraction acting between two particles is directly proportional to the product of their masses and inversely proportional to the square of distance between them .This is called the universal law of gravitation.

A stone dropped from a height falls towards the earth because the earth exerts a force of attraction (gravity)on the stone and pulls it down.

Earth attracts all the objects towards it centre.The force with which earth pulls the objects towards it is called the gravitational force of earth or gravity.