Engineering Mechanics
The point, through which the whole weight of the body acts, irrespective of its position, is known as

Center of gravity
Moment of inertia
Center of percussion
Center of mass

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Engineering Mechanics
One joule means that

Work is done by a force of 1 g when it displaces a body through 1 cm
Work is done by a force of 1 N when it displaces a body through 1 m
Work is done by a force of 1 dyne when it displaces a body through 1 cm
Work is done by a force of 1 kg when it displaces a body through 1 m

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