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Physics (AS & A Level) · May / June 2017 · Paper 12 · Question 18

9702Energy conservation

What is a correct derivation of the equation relating power, force and velocity?

  1. Apower = work done / time taken and work done = force × displacement; so power = (force × displacement) / time taken; so power = force × velocity
  2. Bpower = work done / time taken and work done = force × distance; so power = (force × distance) / time taken; so power = force × velocity
  3. Cpower = work done / time taken and work done = force / displacement; so power = (force / displacement) × time taken; so power = force / velocity
  4. Dpower = work done / time taken and work done = force / distance; so power = (force / distance) × time taken; so power = force / velocity

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Correct answer: A. power = work done / time taken and work done = force × displacement; so power = (force × displacement) / time taken; so power = force × velocity

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