The force which can do no work on the body on which it acts:
Correct answer: D. Centripetal force
- A. Frictional force
- B. Elastic force
- C. Gravitattional force
- D. Centripetal force
Explanation
Option D is the correct answer. The centripetal force can do no work on the body on which it acts, as it keeps the object moving in a circular path by changing the direction of the object's velocity. It does not change the magnitude of the velocity, and it always acts perpendicular to the displacement, resulting in no work being done. The other options are incorrect because they either involve forces that can do work in certain situations (frictional, gravitational forces) or forces that do work when stretching or compressing (elastic force).
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About Work
Work is done when a force produces displacement, with its value determined by the component of force along the displacement. The topic covers positive, negative and zero work, work by variable forces from force-displacement graphs, and the connection between net work and change in kinetic energy.
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