Spring balance and centrifugal pump: what they have in common

1. Step 1. Spring balance — has part — Spring. A spring.
2. Step 2. Spring — is part of — Shock absorber. The spring carries the car's weight while the damper stops it bouncing.
3. Step 3. Shock absorber — is part of — Washing machine. Shock absorbers damp the drum's shaking during the spin.
4. Step 4. Washing machine — has part — Centrifugal pump. A drain pump.

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