Car brake and r-7 rocket: what they have in common

1. Step 1. Car brake — is part of — Electric car. Besides regeneration, ordinary friction brakes are needed.
2. Step 2. Electric car — has part — Pneumatic tyre. An electric car’s wheels have pneumatic tyres.
3. Step 3. Pneumatic tyre — is part of — Landing gear. Aircraft tyres.
4. Step 4. Landing gear — is part of — Lunar module. Legs.
5. Step 5. Lunar module — has part — Liquid-propellant rocket engine. A descent engine.
6. Step 6. Liquid-propellant rocket engine — is part of — R-7 rocket. RD-107 and RD-108 engines.

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