Trackball and piston pump: what they have in common

1. Step 1. Trackball — has part — Ball bearing. The ball rotates on supports.
2. Step 2. Ball bearing — is part of — Washing machine. Drum bearings.
3. Step 3. Washing machine — has part — Shock absorber. Shock absorbers damp the drum's shaking during the spin.
4. Step 4. Shock absorber — has part — Piston. Inside, a piston moves in oil.
5. Step 5. Piston — is part of — Piston pump. The piston draws in and pushes out liquid.

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