Horseshoe and screw press: what they have in common

1. Step 1. Horseshoe — is part of — Horseshoe. An iron arc shaped to the hoof.
2. Step 2. Horseshoe — uses — Nail. It is nailed on.
3. Step 3. Nail — uses — Wedge. The point of a nail pushes the wood apart.
4. Step 4. Wedge — works like — Inclined plane. A wedge is a moving inclined plane.
5. Step 5. Inclined plane — evolved into — Screw. A screw is an inclined plane wrapped around a cylinder.
6. Step 6. Screw — is used in — Screw press. The force is produced by turning a screw.

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