Pile driver and electric fan: what they have in common

1. Step 1. Pile driver — uses — Universal gravitation. A falling weight.
2. Step 2. Universal gravitation — is used in — Water tower. Pressure from height.
3. Step 3. Water tower — has part — Centrifugal pump. Filled by pumps.
4. Step 4. Centrifugal pump — has part — Impeller. The impeller accelerates the liquid.
5. Step 5. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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