GCSE Physics (AQA)

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Calculating Moments

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Forces Moments, levers and gears

Calculating Moments

2:04 Moments
Spec 4.5.4
Previous Stopping Distance Values Next Principle of Moments
  • Moment of a force measures the turning effect around a pivot.
  • Forces cause rotation when applied at a distance from a pivot.
  • Moment is calculated as force multiplied by perpendicular distance (M = F x D).
  • Distance is measured from the pivot to the point of action of the perpendicular force.
  • Non-perpendicular forces result in shorter distances and smaller moments.
  • A force directed through a pivot creates no rotation (perpendicular distance is zero).
  • GCSE exam problems will involve clear perpendicular forces.
  • Force is measured in Newtons, distance in meters, and moment in Newton meters.
  • Example: Calculate the moment caused by a 6 Newton force at corner C of a rectangular sheet.
  • Step 1: Determine the perpendicular distance (2 meters).
  • Step 2: Substitute values into the moment equation (Moment = 6 Newtons x 2 meters = 12 Newton meters).

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