Spindle shaft and electric motor: what they have in common

1. Step 1. Spindle shaft — is part of — Spindle. The axis on which the thread is wound.
2. Step 2. Spindle — uses — Angular momentum. Spinning the spindle twists the thread.
3. Step 3. Angular momentum — is used in — Reaction wheel. Conservation of angular momentum.
4. Step 4. Reaction wheel — has part — Electric motor. An electric motor spins it.

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