Bicycle brake and knife: what they have in common

1. Step 1. Bicycle brake — is part of — Bicycle. Brakes stop the bicycle.
2. Step 2. Bicycle — has part — Bicycle drivetrain. The drivetrain transfers the force of the legs to the rear wheel — the main difference from a kick scooter.
3. Step 3. Bicycle drivetrain — has part — Crank. The cranks turn the motion of the legs into rotation.
4. Step 4. Crank — is part of — Meat grinder. A handle.
5. Step 5. Meat grinder — has part — Knife. A cross-shaped blade.

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