Mon Prof Augmenté
Gears turning each other
Age 11 · Technology
When two gears mesh, their teeth push each other, so one turns the opposite way to the other. A big gear driven by a small one turns more slowly.
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Age 11: open this week
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In the picture
- Small gear: the driver, which turns fast
- Large gear: it turns the opposite way, more slowly
- Meshing teeth: they push each other round
Examples
- A bicycle’s pedal gear turning the smaller gear at the back wheel
- The gears inside a wind-up clock or a hand-cranked egg whisk
Key takeaways
- Two meshing gears always turn in opposite directions.
- A large gear driven by a small one turns more slowly.
Quiz: Gears turning each other (Age 11)
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Two gears are meshed together. If one turns clockwise, which way does the other turn?
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A small gear drives a large gear. How does the large gear turn compared with the small one?
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How does one gear make the gear next to it turn?
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