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Q: If the work done is zero, then the angle between force and displacement is –
  • A. 0º
  • B. 90º
  • C. 45º
  • D. 30º
Correct Answer: Option B - We know that, W = F. d cosθ when, W = 0 0 = F. d cos θ So cos θ= 0 = cos 90⁰ 0 = 90⁰ In the case of zero work the angle between the displacement and the applied force is 90 degree.
B. We know that, W = F. d cosθ when, W = 0 0 = F. d cos θ So cos θ= 0 = cos 90⁰ 0 = 90⁰ In the case of zero work the angle between the displacement and the applied force is 90 degree.

Explanations:

We know that, W = F. d cosθ when, W = 0 0 = F. d cos θ So cos θ= 0 = cos 90⁰ 0 = 90⁰ In the case of zero work the angle between the displacement and the applied force is 90 degree.