When a ceiling fan is switched off, it continues to spin for a few seconds before coming to a complete stop.…

When a ceiling fan is switched off, it continues to spin for a few seconds before coming to a complete stop. Where does its kinetic energy go?
  1. It is completely destroyed and disappears from the universe
  2. It is converted into heat and sound energy due to air resistance and bearing friction
  3. It transforms back into electrical energy and flows into the wires
  4. It is stored as potential energy inside the fan blades forever

Solution

Energy cannot be destroyed. Friction and air resistance convert the fan's kinetic energy into heat energy and faint sound energy as it slows down.

Asked in: Homi Bhabha Practice

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