Twisted rope strands and heat pump: what they have in common

1. Step 1. Twisted rope strands — is part of — Rope. Twisted bundles of fibre.
2. Step 2. Rope — is part of — Yo-yo. A thread.
3. Step 3. Yo-yo — uses — Conservation of energy. Potential → kinetic energy.
4. Step 4. Conservation of energy — is used in — Thermodynamics. The first law of thermodynamics is the conservation of energy.
5. Step 5. Thermodynamics — is used in — Heat pump. A heat pump moves heat from cold to warm by spending work — by the laws of thermodynamics.

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