Moped and conveyor belt: what they have in common

1. Step 1. Moped — has part — Pedal. A moped can be pedalled.
2. Step 2. Pedal — is part of — Bicycle drivetrain. The pedals take the force of the legs.
3. Step 3. Bicycle drivetrain — has part — Roller chain. The chain carries rotation from the front sprocket to the rear one.
4. Step 4. Roller chain — is part of — Escalator. A chain pulls the steps.
5. Step 5. Escalator — works like — Conveyor belt. An escalator is a conveyor with steps.

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