Every body in this universe attracts every other body it is a central force.
The magnitude of the gravitational force F that two particles of masses m1 and m2 are separated by a distance r exert on each other is given by
Vector form : According to Newton’s law of gravitation
(ii) The value of G is 6.6710-11 N-m2 kg-2 in S.I. and 6.6710-8 dyne-cm2-g-2 in C.G.S. system.
(iii) Dimensional formula [M-1L3T-2].
(iv) G does not depend upon the nature and size of the bodies.
(v) Does not depend upon the nature of the medium between the two bodies.
F = F1 + F2 + F3 + ………
♦It is a conservative force