Bicycle and needle: what they have in common

1. Step 1. Bicycle — has part — Bicycle drivetrain. The drivetrain transfers the force of the legs to the rear wheel — the main difference from a kick scooter.
2. Step 2. Bicycle drivetrain — has part — Crank. The cranks turn the motion of the legs into rotation.
3. Step 3. Crank — is part of — Sewing machine. A crank turns rotation into the stroke of the needle.
4. Step 4. Sewing machine — has part — Needle. A needle with the eye near its point.

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