Chains for swinging and screw press: what they have in common

1. Step 1. Chains for swinging — is part of — Battering ram. Chains or ropes for swinging.
2. Step 2. Battering ram — uses — Newton’s laws. The momentum of a heavy log.
3. Step 3. Newton’s laws — is used in — Truss. A triangle is a rigid shape.
4. Step 4. Truss — has part — Beam. Members.
5. Step 5. Beam — is part of — Lever. A lever is a rigid beam that turns around a pivot.
6. Step 6. Lever — is part of — Screw press. A lever for turning the screw.

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