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If a body is whirled in a circle, then the work done on it _______.

This question was previously asked in
RRB ALP CBT I 17 Aug 2018 Shift 3 Official Paper
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  1. cannot be determined
  2. is negative
  3. is zero
  4. is positive 

Answer (Detailed Solution Below)

Option 3 : is zero
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Detailed Solution

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The correct answer is Zero.

Key Points

  • When an object rotates in a circle the work done is zero because, in a circular motion, the displacement is always perpendicular to the applied force.
  • Also, when a body moves along a circle, the centripetal force acts along the radius of the circle and is perpendicular to the motion of the body.

Important Points

  • Work done:
    • work done is defined as the multiplication of the magnitude of the displacement d and the component of the force in the direction of the displacement.
    • Work done through force (F) is equal to a change in kinetic energy.

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