Which of the following type of force cannot do work on which it acts?
Correct answer: B. Centripetal force
- A. Frictional force
- B. Centripetal force
- C. Gravitational force
- D. Restoring force
Explanation
W = F.dW = Fcd Cosθ = Fd cos90º=Fcd (0)= 0Due to centripetal force the object will move in a circular path. In the circular path, the centripetal force "Fc" is perpendicular to displacement "d". For circular motion, the centripetal force always acts at right angles to the motion. It changes the direction of the motion, but it does no work on the object.
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About Work and Energy
Work transfers energy when a force causes displacement, while kinetic energy, gravitational potential energy and power describe motion, position and the rate of energy transfer. The work-energy theorem links net work with change in kinetic energy, and efficiency accounts for energy losses rather than treating them as energy destruction.
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