Wooden rifle stock and electric motor: what they have in common

1. Step 1. Wooden rifle stock — is part of — Mosin rifle. A wooden stock.
2. Step 2. Mosin rifle — is a kind of — Rifle. A rifle.
3. Step 3. Rifle — has part — Rifling. Rifling.
4. Step 4. Rifling — uses — Angular momentum. Spin stabilizes the bullet.
5. Step 5. Angular momentum — is used in — Reaction wheel. Conservation of angular momentum.
6. Step 6. Reaction wheel — has part — Electric motor. An electric motor spins it.

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