CBSE Class 9 Answered

Any two bodies in the universe with masses in this universe will experience a gravitational force of attraction towards each other whose magnitude is directly proportional to the product of the masses of the two bodies and inversely proportional to the square of the distance between them. The direction of this force will be along the line joining the centre of masses of the two bodies and the nature of this force will be attractive. So, if two bodies have mass M1 and M2 and distance between them is R, the Gravitational force will be given by

F=GM1M2/R²

where G is a constant of gravitation. Since this law applies to all the bodies in the universe, this is called Universal law of gravitation.