Trackball ball and vacuum pump: what they have in common

1. Step 1. Trackball ball — is part of — Trackball. It is spun with the fingers.
2. Step 2. Trackball — has part — Ball bearing. The ball rotates on supports.
3. Step 3. Ball bearing — is part of — Induction motor. Bearings.
4. Step 4. Induction motor — has part — Stator. The windings create a rotating field.
5. Step 5. Stator — is part of — Vacuum pump. A cylindrical chamber.

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