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Question
A force F acts on a body and displaces it by a distance S in a direction at an angle θ with the direction of force.
Write the expression for the work done by the force.
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Solution
Work done = Force × displacement
However, when a force causes the body to move in a direction different from the force's direction.
Then work done W = Force × the component of body displacement in the direction of force.
W = F × S Cos θ
∴ W = F S Cos θ
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