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Physics (AS & A Level) · Oct / Nov 2020 · Paper 12 · Question 8

9702Momentum and Newton’s laws of motion

What is not a statement of one of Newton's laws of motion?

  1. AIf body X exerts a force on body Y, body Y exerts an equal and opposite force on body X.
  2. BIf no resultant force acts on a body it has constant velocity.
  3. CThe rate of change of momentum of a body is proportional to the resultant force acting on it and takes place in the direction of the force.
  4. DThe total momentum of a system of interacting bodies is constant if there is no external force.

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Correct answer: D. The total momentum of a system of interacting bodies is constant if there is no external force.

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