App store and archimedes’ screw: what they have in common

1. Step 1. App store — uses — Mobile app. A catalogue.
2. Step 2. Mobile app — is used in — Bike sharing. An app.
3. Step 3. Bike sharing — uses — Bicycle. Bicycles.
4. Step 4. Bicycle — has part — Bicycle drivetrain. The drivetrain transfers the force of the legs to the rear wheel — the main difference from a kick scooter.
5. Step 5. Bicycle drivetrain — has part — Crank. The cranks turn the motion of the legs into rotation.
6. Step 6. Crank — is part of — Archimedes’ screw. A handle or rotary drive.

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