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Physics (AS & A Level) · May / June 2025 · Paper 13 · Question 9

9702Momentum and Newton’s laws of motion

Which statement defines force?

  1. AWhen a force acts on a body that is free to move, the force is the product of the mass of the body and its acceleration.
  2. BWhen a force acts on a body that is free to move, the force is the rate of change of momentum of the body.
  3. CWhen a force acts on a body that is free to move, the force is the work done by the force divided by the distance moved by the body.
  4. DWhen a force acts on a lever and causes a moment, the force is the moment divided by the perpendicular distance of the force from the pivot.

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Correct answer: B. When a force acts on a body that is free to move, the force is the rate of change of momentum of the body.

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