Law of gravitation and Newton’s third law of motion:

            It is to be noted that mass m₁ attracts m₂ towards it with a force of F while mass m₂ attracts m₁ towards it with a force of the same magnitude F but in the opposite direction. If the force acting on m₁ is considered as action then the force acting on m₂ will be the reaction. The action and reaction due to the force of gravitation are equal in magnitude but opposite in direction. This is consistence with Newton’s third law of motion which states, that to every action there is always an equal but opposite reaction.