Threaded bottle neck and rock drill: what they have in common

1. Step 1. Threaded bottle neck — is part of — Plastic bottle. A thread for the cap.
2. Step 2. Plastic bottle — uses — Injection moulding. Preforms are moulded and then blown.
3. Step 3. Injection moulding — uses — Hydraulics (Pascal’s law). Hydraulic presses.
4. Step 4. Hydraulics (Pascal’s law) — is used in — Shock absorber. Oil flows through valves, damping oscillations.
5. Step 5. Shock absorber — has part — Piston. Inside, a piston moves in oil.
6. Step 6. Piston — is part of — Rock drill. A percussion piston.

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