The Egg-Shaped Cam Toy

In the picture

1. 1Crank handle: your hand turns it round and round
2. 2Egg-shaped cam: spins with the axle, its pointed end pushes up
3. 3Follower stick: rides on the cam and moves up and down
4. 4Paper bird: rises and falls as the stick moves

Examples

• A wind-up toy where a little animal bobs its head up and down
• A music box where turning parts lift tiny pins or figures

Quiz: The Egg-Shaped Cam Toy (Age 8)

1. 1

   What does a cam do in a toy like this?

   • It changes up-and-down motion into turning motion
   • It makes the bird spin round and round
   • It changes turning motion into up-and-down motion
2. 2

   When does the follower stick go up the highest?

   • When the handle stops turning
   • When the pointed end of the cam is on top
   • When the round end of the cam is on top
3. 3

   What does the follower stick do while the cam turns?

   • It turns the handle for you
   • It spins round and round with the cam
   • 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.