Spindle and internal combustion engine: what they have in common

1. Step 1. Spindle — uses — Angular momentum. Spinning the spindle twists the thread.
2. Step 2. Angular momentum — is used in — Flywheel. A flywheel stores rotational energy: conserved angular momentum smooths a machine's motion.
3. Step 3. Flywheel — is part of — Internal combustion engine. The flywheel smooths out the engine’s strokes.

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