The work W done by a constant force F when its point of application undergoes a displacement s is defined to be
W = F s cos q
where q is the angle between and as indicated in figure. Only the component of along s, that is, F cos q, contributes to the work done. Strictly speaking, the work is done by the source or agent that applies the force. Work is a scalar quantity and its SI unit is the joule (J).
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