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Question 30403
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Work, Power and Energy: Work — Negative Work MCQ

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Work — Negative WorkEasyQuestion 30403

Question

When is work done by a force negative?
  1. A
    When force and displacement are in the same direction
  2. B
    When force and displacement are perpendicular
  3. C
    When the angle between force and displacement is between 90° and 180°
    Correct
  4. D
    When the object moves at constant speed

Correct answer

When the angle between force and displacement is between 90° and 180°

Explanation

W = Fs cosθ. When 90° < θ ≤ 180°, cosθ < 0, so work is negative.

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