Centripetal force performs_______________?
Correct answer: D. No work
- A. Maximum work
- B. Minimum work
- C. Negative work
- D. No work
Explanation
Centripetal force acts radially inward, while instantaneous displacement is tangential to the circle. The angle between them is 90°, so work W = Fs cos 90° = 0 J. The likely mistake is choosing negative work, which would require a force component opposite to the displacement.
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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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