Newton's Universal Law of Gravitation states that any two objects exert a gravitational force of attraction on each other. The direction of the force is along the line joing the objects. The magnitude of the force is proportional to the product of the gravitational masses of the objects, and inversely proportional to the square of the distance between them.
For e.g.
m1 exerts a force on m2 .
m2 exerts a force on m1 .
Gravitational force = (G*m1*m2)/r2 G is Newton's constant: G = 6.67 x 10- 11 N m 2 /kg 2.
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