GCSE Physics (AQA)

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Gears

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Forces Moments, levers and gears

Gears

1:57 Applying Moments
Spec 4.5.4
Previous Counterweights Next Gear Ratios
  • Gears transfer forces through turning effects.
  • Used in machines like clocks, cranes, and cars.
  • Input force causes gears to rotate, transferring force to a device.
  • Forces between gears are transferred through contact forces.
  • Reaction force at each gear is equal and opposite to the input force.
  • Contact forces create moments, causing gears to spin.
  • Moment equals force multiplied by perpendicular distance.
  • Gears have pivots at the center, with reaction forces far from this point.
  • Contact forces cause gears to spin while maintaining contact.
  • Gears have different radii, resulting in different moments.
  • Larger gears have more teeth and experience larger moments.
  • Larger gears spin at greater speed, transferring bigger rotational effects.
  • Gears are an example of the application of moments and can change the size of a moment.

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