The Cam That Lifts a Bird

In the picture

1. 1Crank handle: your hand turns it round and round
2. 2Cam: a pear-shaped wheel that spins with the axle
3. 3Follower stick: it rides on the cam and moves up and down

Examples

• A wind-up toy where a little animal bobs its head up and down
• A music box or automaton toy where figures jump as a handle turns

Quiz: The Cam That Lifts a Bird (Age 8)

1. 1

   What does a cam do in a moving toy?

   • It changes up-and-down motion into round-and-round motion
   • It makes the handle turn faster and faster
   • It changes round-and-round motion into up-and-down motion
2. 2

   When does the follower stick go highest?

   • When the cam’s round side is at the top
   • When the cam’s pointy side is at the top
   • When the cam stops spinning
3. 3

   What does the follower stick do?

   • It spins round and round with the axle
   • It is turned round by your hand
   • It rides on the cam and moves up and down

The answers, each with its explanation, are in the app. This quiz is free there while the lesson is in the free week.