The value of G explains why the gravitational force between the Earth and the Sun is so great while the same force between two small objects (for example between two human beings) is negligible.

**Gravitational
Constant**

In
the law of gravitation, the value of gravitational constant G plays a very
important role. The value of G explains why the gravitational force between the
Earth and the Sun is so great while the same force between two small objects
(for example between two human beings) is negligible.

The
force experienced by a mass ‘m’ which is on the surface of the Earth (Figure
6.7) is given by

*M _{E} *-mass of the Earth, m - mass of the

Equating
Newton’s second law, *F* = *mg*, to equation
(6.11) we get,

Now
the force experienced by some other object of mass M at a distance r from the
center of the Earth is given by,

Using
the value of g in equation (6.12), the force F will be,

From this it is clear that the force can be calculated simply by knowing the value of g. It is to be noted that in the above calculation G is not required.

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11th Physics : Gravitation : Gravitational Constant |

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