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EXPLAIN NEWTONS LAW OF GRAVITATION?

The Universal law of Gravitation was given by Newton. So it is also known as Newton's Law of  gravitation.

According to Universal Law of Gravitation : Every body in the Universe attracts every other body with a force which is directly proportional to the product of their masses and inversely  proportional to the square of the distance between them.

Consider  two bodies A and B of masses m₁ and m₂ are lying at a distance r from each other. Let the force of attraction between these two bodies be F.  Now, according to the Universal law of Gravitation.

(i). The force between two bodies is directly proportional to the product of  their masses.That is ,
                F ? m₁m₂   ___________________ (1)
(ii) The force between two bodies is inversely proportional to the square of the distance between them.That is,

                F ?   1/ r² ___________________ (2)
Combining (1) and (2), we get
                F ? m₁m₂ /  r²
Gravitational force, F = Gm₁m₂/ r²

where, G is a constant known as "Universal Gravitational Constant".