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## Course Description

**Newton’s law of gravitation: **Every particle of matter in the universe attracts every other particle with a force which is directly proportion to the product of their masses and inversely proportional to the square of the distance between them.

Let us consider two bodies of masses m_{1} and m_{2} with their centers separated by a distance of r. F is the force (in magnitude) of gravitational attraction between two bodies. According to Newton’s law of gravitation,

F m_{1}m_{2} and F 1/d^{2} so, F m_{1}m_{2}/d^{2} or, F = Gm_{1}m_{2}/d^{2}

where G is the universal constant of gravitation.

G = 6.67 10^{-8}dyne cm^{2}g^{-2} (C.G.S.) or, G = 6.67 10^{-11}Nm^{2}kg^{-2}.

Dimension of G = [F][r^{2}]/[ m_{1}m_{2}]=[M^{-1}L^{3}T^{-2}]

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