Gears, Cams & Linkages
📋 What it is
Gears, cams and linkages convert and redirect motion — turning spinning into pushing, or steady into rhythmic.
🗣️ Coach says
These mechanisms shape MOTION itself. Gears change speed and direction of rotation; a CAM (an off-round wheel) turns steady spinning into an up-and-down or rhythmic push; LINKAGES (connected bars) redirect motion around corners. Machines from engines to toys use these to turn one kind of motion into another.
🧠 Memory hook
Gears change rotation · cams turn spin into rhythmic push · linkages redirect motion. Convert one motion to another.
😂 Giggle
Why was the wheel always so tired?
Because it never stopped going around!
😲 Whoa!
A car engine uses cams (the "camshaft") to precisely open and close valves at exactly the right instant, thousands of times a minute — turning smooth spinning into perfect rhythmic timing.
✅ Quick check: What does a cam do in a machine?
Say your answer out loud first — then reveal.
It converts steady rotation into an up-and-down or rhythmic motion (via its off-round shape).
Cams transform rotary motion into rhythmic motion.
🧪 Try it! (2 minutes)
Watch a toy or clock mechanism if you can — spot how spinning turns into other motions.