Chains for swinging and refrigerator: 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 — includes — Reaction force. Reaction is Newton’s third law.
4. Step 4. Reaction force — is used in — Turbojet engine. Thrust is the reaction of the jet.
5. Step 5. Turbojet engine — has part — Compressor. The compressor compresses the air.
6. Step 6. Compressor — is part of — Refrigerator. A compressor with an electric motor.

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