# Derive the expression for the force of attraction between two bodies. Define gravitational constant.

According to Newton's Law of Gravitation the force of attraction between two bodies with masses m and M with distance between them d is ,$F=\frac{GMm}{{d}^{2}}$

Where G is the gravitational constant defined as the force between two objects with which they attract each other per unit mass and the distance between them being unity .

Now the value of G = $6\xb767\times {10}^{-8}dyne/c{m}^{2}=6\xb767\times {10}^{-11}N/{m}^{2}$

Regards

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