Stopwatch crown button and syringe: what they have in common

1. Step 1. Stopwatch crown button — is part of — Stopwatch. A cam starts and resets the hand.
2. Step 2. Stopwatch — has part — Balance wheel. A balance wheel sets the pace.
3. Step 3. Balance wheel — has part — Spring. A spiral hairspring returns the balance.
4. Step 4. Spring — is part of — Shock absorber. The spring carries the car's weight while the damper stops it bouncing.
5. Step 5. Shock absorber — has part — Piston. Inside, a piston moves in oil.
6. Step 6. Piston — is part of — Syringe. A plunger.

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