Work is done by a force only when this force, acting on a body, produces some displacement of the body in its own direction.
For example: Work is done, when we hit a football. In this case, when we hit the football, force is applied on the football and the football travels a certain distance before landing on the ground.
A student, sitting on a chair, may feel that she/he has done a ‘lot of work’ by studying a whole chapter of the book. The scientific meaning of the term ‘work’ however, tells that the work done by the student, in such a case, is zero.
Measurement of Work
It is easy to realise that that the work done by a given force, depends on
(a) Amount of force applied.
(b) Displacement of the object produced by the applied force.
W = F x S
Where, F = amount of force
S = displacement produced in the direction of force
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