Coil spring and hammer: what they have in common

1. Step 1. Coil spring — is part of — MacPherson strut. A spring.
2. Step 2. MacPherson strut — has part — Shock absorber. A shock absorber in the strut.
3. Step 3. Shock absorber — has part — Piston. Inside, a piston moves in oil.
4. Step 4. Piston — uses — Cylinder. A piston slides inside a cylinder, like the plunger of a syringe.
5. Step 5. Cylinder — is part of — Steam hammer. A steam cylinder.
6. Step 6. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.

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