Mon Prof Augmenté
Cam Toy in a Box
Age 12 · Crafts
A crank turns a wooden dowel, and a pear-shaped cam pushes a thin rod up and down. The rod lifts a small cardboard bird above the box.
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Every lesson is open to everyone for 7 days after it is published. This one came out on October 14, 2026: its text stays readable here, and its picture opens with a subscription.
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In the picture
- The crank handle: a grip for turning the dowel by hand.
- The dowel axle: the rod that carries the cam and turns with the crank.
- The pear-shaped cam: the off-centre wheel that pushes the follower as it turns.
- The follower rod: the upright stick that moves up and down when the cam pushes it.
- The cardboard bird: the object lifted above the box by the moving rod.
Examples
- A car engine uses a camshaft to open and close valves.
- An electric toothbrush turns a motor’s spin into a back-and-forth brush movement.
Key takeaways
- A cam changes turning motion into up-and-down or back-and-forth motion.
- The cam’s shape controls how far and when the follower moves.
Quiz: Cam Toy in a Box (Age 12)
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According to the card, what does a cam do?
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In the cam toy, what does the pear-shaped cam push as it turns?
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On the card, what controls how far and when the follower moves?
The answers, each with its explanation, are in the app. This lesson has left the free week, so its quiz is part of the subscription.
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