Three-phase system and cannon: what they have in common

1. Step 1. Three-phase system — is used in — Induction motor. Three phases create a rotating field.
2. Step 2. Induction motor — has part — Ball bearing. Bearings.
3. Step 3. Ball bearing — is part of — Road wheel. The road wheels turn on bearings.
4. Step 4. Road wheel — is part of — Continuous track. Road wheels roll along the track and carry the vehicle’s weight.
5. Step 5. Continuous track — is part of — Infantry fighting vehicle. Tracks.
6. Step 6. Infantry fighting vehicle — has part — Cannon. An autocannon.

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