Definition:Force of Gravity

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The force of gravity or gravitational force is the force on a body as a result of Newton's Law of Universal Gravitation.

When used in an unqualified sense, it is usual for this to mean the force on a body at the surface of the Earth.

From Gravity at Earth's Surface, this is approximately $9.8 \ \mathrm N \ \mathrm{kg}^{-1}$

The force of gravity varies across the earth's surface, and therefore it makes little sense to use it as a standard.

However, the CGPM adopted a standard acceleration of gravity of $9.806 \, 65 \ \mathrm N \ \mathrm{kg}^{-1}$ in 1901.