# Pencil Spinner for Middle & Senior School

## Basic Information

A pencil to explore rotation, resonance, Newton's colour wheel, toys from trash? Yes, please! Arvind Gupta demonstrates it for you.

Duration:
00 hours 15 mins
Introduction:

A pencil to explore rotation, resonance, Newton's colour wheel, toys from trash? Yes, please!

Objective:

To explore the concepts of

• rotation
• Newton's colour wheel
• vibration
• kinetic energy
Activity Steps:

PENCIL SPINNER

Take a pencil with an eraser on one end.

With the help of a pen knife make six “V” notches near the rubber end. The notches should be deep.

Then take a 1.5-cm x 3.5-cm rectangle from an old greeting card to make the fan.

Mark the two diagonals to locate the centre and make a 3-mm diameter hole with a pencil point.

Place the card-fan in a pin and poke the pin in the eraser rubber. The fan should rotate freely on the pin.

Fix a small rubber stopper to prevent the fan from flying away.

Hold the pencil with one hand. Hold a ball pen refill near its end and rub it to-and-fro on the notches with your other hand.

You will be surprised to see the card fan spinning!

Here is the video clip

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