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GCSE Physics · key term
A toothed wheel that turns about an axle and can transmit a turning effect to another gear.
Used by AQA, Edexcel and OCR
Paper 2
Revise: Levers and GearsA gear is a toothed wheel that rotates about an axle. When the teeth of two gears mesh, a tooth on the driving gear pushes on a tooth of the other gear. That force acts away from the second gear’s axle, so it produces a moment and turns the second gear.
Specification 9.9P · Paper 2
A toothed wheel that turns about an axis and can transmit a turning effect to another gear through contact between their teeth.
Revise: Levers and GearsA lever or a pair of gears can transmit this turning effect from where a force is applied to where it is needed.
Specification P2.3m · Paper 1 (Foundation), Paper 3 (Higher)
A toothed wheel that transmits rotation to another gear or a chain.
Revise: Levers and gearsLevers and gears transmit this turning effect from where a force is applied to where it is needed. By changing the distances involved, they can make a smaller input force produce a larger output force or turning moment.
Paper 1, Paper 2
A toothed wheel that turns about an axle and transfers a rotational effect to another gear.
Revise: Circular Motion, Moments, Levers and GearsGears are toothed wheels. When two gears mesh, their teeth push on one another and transfer a rotational effect from the driving gear to the driven gear. The two gears rotate in opposite directions.
For meshing gears, state both the direction of rotation and the effect of gear size on turning effect and speed.
For gears, explain that interlocking teeth exert forces on each other; two directly meshed gears turn in opposite directions.
Identify the input and output before using a ratio: a larger driven gear turns more slowly but produces a greater turning moment.
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