Pickup truck and centrifugal pump: what they have in common

1. Step 1. Pickup truck — has part — Leaf spring. The rear axle springs.
2. Step 2. Leaf spring — evolved into — Suspension. Car suspension inherited carriage leaf springs.
3. Step 3. Suspension — has part — Shock absorber. Shock absorbers are part of the suspension.
4. Step 4. Shock absorber — is part of — Washing machine. Shock absorbers damp the drum's shaking during the spin.
5. Step 5. Washing machine — has part — Centrifugal pump. A drain pump.

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