Chainsaw and elevator: what they have in common

1. Step 1. Chainsaw — has part — Sprocket. A sprocket drives the chain.
2. Step 2. Sprocket — is part of — Chain drive. The sprockets engage the chain’s rollers.
3. Step 3. Chain drive — works like — Belt drive. A belt and a chain are both flexible links between shafts; the chain does not slip.
4. Step 4. Belt drive — has part — Pulley. The belt wraps around pulleys.
5. Step 5. Pulley — is part of — Elevator. The rope runs over a pulley.

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