Pendulum and electric fan: 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 — Water-jet propulsion. A jet of water.
4. Step 4. Water-jet propulsion — has part — Impeller. An impeller.
5. Step 5. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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