Sled body and freezer: 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 — has part — Compressor. A compressor pumps the air.
5. Step 5. Compressor — is part of — Freezer. A compressor compresses the refrigerant.

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