Sling and electric fan: what they have in common

1. Step 1. Sling — uses — Centrifugal effect. The projectile is whirled around.
2. Step 2. Centrifugal effect — is used in — Impeller. The vanes throw the liquid away from the centre.
3. Step 3. Impeller — is part of — Electric fan. A fan's blades are an impeller that pushes the air.

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