Mechanisms That Make Things Move
A mechanism turns one movement into another: a push into a lift, a turn into a wobble, a small force into a big one. Levers, linkages, cams and cranks are the pieces a maker reaches for.
What a learner can do afterwards
- Name the mechanism inside a moving toy or a pop-up card and say what it converts
- Explain what a cam does to a follower and why the cam's shape decides the movement
- Pick a mechanism for a stated job, such as making a puppet's arm wave
- Say why a linkage can reverse a direction of movement
1 · Read
Turn a key on a wind-up toy and its legs wobble. That's a mechanism: it turns one movement into another, a push into a lift. Levers, linkages, cams and cranks are the parts a maker reaches for.
A cam is a wheel that is not round, pushing a follower rod. As the cam turns, its changing shape lifts and drops the rod. The shape of the cam decides the movement of the follower.
A linkage joins bars that push and pull each other, and it can even flip a direction. To wave a puppet arm you would pick a crank or a linkage, since a turning input suits a waving output. Name the full chain and what goes in and out.
Open a moving toy or a pop-up card and name the part inside. Then say what goes in and what comes out, like turn in, lift out.
Name the mechanism, then state which movement goes in and which comes out.
2 · Watch
Take it off screen
Where it sits
This opens up
Where this leads
Jobs that lean on this skill. Follow one to see everything it is built on.
8 questions wait behind this lesson, each with its answer explained. Every answer feeds the sky: stars light as they are learned, and dim when it is time to come back.