Engineering Mechanics
In order to determine the effects of a force, acting on a body, we must know

All of these
Line of action of the force
Nature of the force i.e. whether the force is push or pull
Magnitude of the force

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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 dyne 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 kg when it displaces a body through 1 m

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