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Q: If the work done is negative, then what will be the angle between the force and displacement?
  • A. 45⁰
  • B. 0⁰
  • C. 90⁰
  • D. 180⁰
Correct Answer: Option D - If the angle between the force and the displacement is 90 degrees (θ = 90°), then the work done W = F.d.cosθ = F.d. cos 90° = 0 J If the angle between the force and displacement is 180 degrees (θ = 180°) then the work done will be negative because the value cos 180⁰ = -1. W = F.d.cos180⁰ = - Fxd = 180⁰
D. If the angle between the force and the displacement is 90 degrees (θ = 90°), then the work done W = F.d.cosθ = F.d. cos 90° = 0 J If the angle between the force and displacement is 180 degrees (θ = 180°) then the work done will be negative because the value cos 180⁰ = -1. W = F.d.cos180⁰ = - Fxd = 180⁰

Explanations:

If the angle between the force and the displacement is 90 degrees (θ = 90°), then the work done W = F.d.cosθ = F.d. cos 90° = 0 J If the angle between the force and displacement is 180 degrees (θ = 180°) then the work done will be negative because the value cos 180⁰ = -1. W = F.d.cos180⁰ = - Fxd = 180⁰