A force of 10 N acts on the body and the body moves 10 m distance perpendicular to it. Work done by the force on body is:
Correct answer: C. Zero
- A. 10 J
- B. 100 J
- C. Zero
- D. Infinite
Explanation
Work W = F d cosθ; here θ = 90°, cos90° = 0, so W = 10×10×0 = 0 J. A force perpendicular to displacement does no work.
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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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