🌀 Why Does a Fan Keep Spinning After You Turn It Off?

 

🌀 Why Does a Fan Keep Spinning After You Turn It Off?



– A breeze of Newtonian physics.

You hit the switch.
The fan stops spinning, right?

Nope. It keeps going… slowly… gradually… then finally comes to a stop.

Ever wondered why? Let’s spin into the answer.

🧠 The Science in One Line:

Things that are moving… want to keep moving — unless something makes them stop.

That’s Newton’s First Law of Motion:

An object in motion stays in motion unless acted upon by an external force.

🌀 So why does the fan keep spinning?

Because:

  • It was already moving

  • No more electricity, sure — but nothing is stopping it immediately

There’s no sudden “brake” the moment you turn off the switch.

🛑 What does make it stop?

Two invisible forces:

  1. Air resistance – The fan blades push against air → air pushes back

  2. Friction – Between fan parts (like the motor and bearings)

These slow it down over time.
No current + friction = goodbye momentum

🚲 Same reason a bicycle keeps moving after you stop pedaling!

Your legs stop — but the bike rolls on.
The ground and air slowly pull it to a halt.

Same law. Same science. Different ride. 🚴‍♂️

⚙️ Try this:

Spin a fidget spinner. 🌀
Time how long it keeps rotating.
Now, add a bit of oil (or don't).
Repeat.
You’ll feel the difference in friction.

🎯 Final thought:

When something keeps moving without energy, that’s not magic.
That’s inertia.

                                                                                                      - Sharadhvi Tirakannavar

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