Steel edges and screw press: what they have in common

1. Step 1. Steel edges — is part of — Snowboard. They cut the snow in a turn.
2. Step 2. Snowboard — uses — Friction. It glides over snow.
3. Step 3. Friction — is used in — Ladder. The feet hold on the floor by friction.
4. Step 4. Ladder — uses — Inclined plane. Climbing to a height.
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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