Pendulum and turbojet engine: what they have in common

1. Step 1. Pendulum — uses — Newton’s laws. The swing is described by Newtonian mechanics.
2. Step 2. Newton’s laws — includes — Reaction force. Reaction is Newton’s third law.
3. Step 3. Reaction force — is used in — Turbojet engine. Thrust is the reaction of the jet.

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