1.Always attractive .2.Its a force at a distance.3.weakest force4.equal and opposite5. independent of intervening medium.6.acts along the line joining the centre of 2 bodies.7.long range force.8.weakest force in nature.

Newton's Universal Law of Gravitation:Sir Issac Newton in 1687 proposed a law about the force of attraction between the two objects in the universe which is called law of gravitation.

The falling body on which only force of gravitation of the earth acts is known as freely falling body and such fall of a body is known as free fall.The acceleration with which a body falls towards the earth due to earth's gravitational pull is known as acceleration due to gravity.It is denoted by g.During free fall ,only gravity acts on the objects.

The force of attraction between any two bodies in the universe is called gravitational force .Newton's proposed the universal law of gravitation and showed that the gravitational force between two masses varies inversly proportional to the square of the distance between them.This fact was proved by him on the basis of Keplers laws of planetary motion.The mathematical expression of universal law of gravitation is: F= G m1m2/r2

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