Work done by the centripetal force on a body moving in circle is zero because?
Correct answer: C. The body moves at right angles to F
- A. The body moves parallel to F
- B. The body moves opposite to F
- C. The body moves at right angles to F
- D. The centripetal and centrifugal forces balance each other
Explanation
Work done is zero when force is perpendicular to the displacement. Work done = Fdcosθ where θ is the angle between force and displacement. If θ = 90˚ then cosθ = cos90 which is 0. F x d x 0 = 0
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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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