Block and tackle and heat pump: what they have in common

1. Step 1. Block and tackle — has part — Pulley. A block and tackle is several pulleys and a rope.
2. Step 2. Pulley — is part of — Belt drive. The belt wraps around pulleys.
3. Step 3. Belt drive — is part of — Supercharger. Belt-driven from the crankshaft.
4. Step 4. Supercharger — is a kind of — Compressor. A supercharger.
5. Step 5. Compressor — is part of — Heat pump. A compressor.

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