define the force of gravity
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the force exerted by objects possessing mass is called force of gravity or gravitational force.
ex-the force of gravity causes all objects to fall towards earth.
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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 N 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 9.80665 N kg−1 in 1901.
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