Curling iron and rock drill: what they have in common

1. Step 1. Curling iron — has part — Heating element. An electric curling iron is heated by a heating element, like an iron or a kettle.
2. Step 2. Heating element — is part of — Washing machine. A heating element.
3. Step 3. Washing machine — has part — Shock absorber. Shock absorbers damp the drum's shaking during the spin.
4. Step 4. Shock absorber — has part — Piston. Inside, a piston moves in oil.
5. Step 5. Piston — is part of — Rock drill. A percussion piston.

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