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Question

Write an expression for the work done when a force is acting on an object in the direction of displacement.


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Solution

  1. Work is said to be done when a force is applied to the body and displaces the body.
  2. It is expressed as W=Fscosθ where F = force, s = displacement and θ = angle between the force and the displacement.
  3. As force is acting in the direction of displacement, the angle θ between them would be 0°.
  4. Value of cos0°=1.
  5. Hence, the expression for the given situation is W=Fs and positive.

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