Revolver and watt steam engine: what they have in common

1. Step 1. Revolver — has part — Rifling. A rifled barrel.
2. Step 2. Rifling — uses — Angular momentum. Spin stabilizes the bullet.
3. Step 3. Angular momentum — is used in — Flywheel. A flywheel stores rotational energy: conserved angular momentum smooths a machine's motion.
4. Step 4. Flywheel — is part of — Watt steam engine. The flywheel evens out rotation.

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