GCSE Physics Unit 3 Revision

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Turning Forces and Centre of Mass

  • A moment is the turning effect of a force
  • Moment (Nm) = Force (N) x perpendicular distance (m) between line of action and pivot.
  • For example, a force on a spanner would be what causes a moment or turning effect on the nut. A larger force would mean a larger moment.
  • Using a longer spanner, the same force can exert a larger moment because the distance from the pivot is greater.
  • To get the maximum moment (turning effect) you need to push at right angles (perpendicular) to the spanner.
  • Pushing at any…


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