Roller coaster and hydraulic press: what they have in common

1. Step 1. Roller coaster — has part — Roller chain. A chain lift.
2. Step 2. Roller chain — works like — Continuous track. A track is a closed chain of hinged links driven by a sprocket; the principle is that of a roller chain, on a different scale.
3. Step 3. Continuous track — is part of — Excavator. Most excavators run on tracks.
4. Step 4. Excavator — has part — Hydraulic cylinder. Hydraulic cylinders move the boom and the bucket.
5. Step 5. Hydraulic cylinder — is part of — Hydraulic press. Two cylinders of different diameters.

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