Tower crane and liquid-propellant rocket engine: what they have in common

1. Step 1. Tower crane — has part — Block and tackle. The load is lifted with a block and tackle.
2. Step 2. Block and tackle — is part of — Pile driver. Lifting the weight.
3. Step 3. Pile driver — works like — Battering ram. A battering ram and a pile driver both strike with a heavy weight: one breaks gates, the other drives piles.
4. Step 4. Battering ram — uses — Newton’s laws. The momentum of a heavy log.
5. Step 5. Newton’s laws — is used in — Tsiolkovsky rocket equation. It follows from the conservation of momentum.
6. Step 6. Tsiolkovsky rocket equation — is used in — Liquid-propellant rocket engine. Rocket design relies on Tsiolkovsky’s equation.

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