Sled body and programmable logic controller: what they have in common

1. Step 1. Sled body — is part of — Sledge. A platform.
2. Step 2. Sledge — uses — Friction. Low friction of the runners on snow.
3. Step 3. Friction — is used in — Air brake. Brake shoes slow the wheels through friction.
4. Step 4. Air brake — evolved into — Anti-lock braking system (ABS). Anti-skid systems first appeared in aviation and on railways.
5. Step 5. Anti-lock braking system (ABS) — has part — Microprocessor. A control unit.
6. Step 6. Microprocessor — is part of — Programmable logic controller. A processor.

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