Boomerang elbow and heat pump: what they have in common

1. Step 1. Boomerang elbow — is part of — Boomerang. A bend between the blades.
2. Step 2. Boomerang — uses — Angular momentum. Gyroscopic precession brings the boomerang back.
3. Step 3. Angular momentum — is used in — Yo-yo. Rotation.
4. Step 4. Yo-yo — uses — Conservation of energy. Potential → kinetic energy.
5. Step 5. Conservation of energy — is used in — Thermodynamics. The first law of thermodynamics is the conservation of energy.
6. Step 6. 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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