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2.2

Minor Versionm

by J Mary Leiza

Introduction

This fascinating TACtivity is based on an age-old native American folk toy, called "gee-haw whammy diddle". Apart from being an irresistible activity to play with, it is one where you can observe how vibrations can create perfect circular motion. Several `notches' are made on a pencil, on which another stick is rubbed to produce vibrations, which in turn rotate a spinner attached to the eraser of the pencil. The spinner can be a "Newton Disc" to observe the effects of colours merging.

Video Overview

    • Exercise caution when using scissors and paper cutter.

    • Be wary of the sharp/pointed end of the thumb pin.

  1. Make 6 ‘V’ shaped notches (3-5mm wide) on the pencil with the help of a paper cutter. Making the notches should begin from the eraser end of the pencil. The notches should be made such that you can see the pencil's lead.
    • Make 6 ‘V’ shaped notches (3-5mm wide) on the pencil with the help of a paper cutter.

    • Making the notches should begin from the eraser end of the pencil.

    • The notches should be made such that you can see the pencil's lead.

    • Ensure to leave a gap of about 2 mm between the notches.

  2. Take the given colour disc sticker and cut along the square's outline to get a square colour disc, as shown. You can also make the colour disc by sketching on a square piece paper with sketch pens You can also cut it into a circle, by maintaining the original square's centre as the circle's centre.
    • Take the given colour disc sticker and cut along the square's outline to get a square colour disc, as shown.

    • You can also make the colour disc by sketching on a square piece paper with sketch pens

    • You can also cut it into a circle, by maintaining the original square's centre as the circle's centre.

    • Stick the square colour disc sticker onto a cardboard piece. Cut and remove the extra part of the cardboard.

    • Make a small hole (about 3 mm diameter) at the centre of the fan (colour disc) using a paper punch.

    • To make hole at the center you can also use any sharp object like a safety pin, paper pin/all pin, thumb pin, pen, pencil, etc.

    • Ensure that edge of the hole is smooth.

  3. Place a thumb pin through the hole of the fan. Pierce the thumb pin into the eraser of the pencil. Be careful, when you insert the thumb pin into the pencil that does not have an eraser.
    • Place a thumb pin through the hole of the fan.

    • Pierce the thumb pin into the eraser of the pencil.

    • Be careful, when you insert the thumb pin into the pencil that does not have an eraser.

    • Make sure there is enough room (visible pin) for the fan to spin.

    • Use an ice cream stick to rub on the notches of the pencil.

    • Firmly hold the pencil at its free end in one hand, away from the notches.

    • Hold the ice cream stick in your other hand and apply slight pressure while rubbing it on the notches in one direction (either backward or forward direction).

    • The fan should begin to rotate fast and freely.

    • Colour disc will not spin, if :

    • Holding the pencil very tightly (or loosely) and very close to the notches.

    • Holding the ice cream stick loosely and far away from the notches.

    • Notches are not deep enough.

    • Notches are too far apart or too few.

    • Fan is too big/heavy.

    • Hole in the fan is too small or not centred correctly.

    • Not rubbing with optimum speed and pressure.

  4. Make the toy (as it was done traditionally) using a twig instead of a pencil. Make an ice cream stick spinner. Change the position of the spinners such that the spinners should be placed perpendicular to the notches on the pencil.
    • Make the toy (as it was done traditionally) using a twig instead of a pencil.

    • Make an ice cream stick spinner.

    • Change the position of the spinners such that the spinners should be placed perpendicular to the notches on the pencil.

  5. Make U-notches on the pencil instead of V-notches. Try making fewer notches and shallower notches on the pencil. Make V-notches on the pencil maintaining the distance of 1 cm gap between the notches.
    • Make U-notches on the pencil instead of V-notches.

    • Try making fewer notches and shallower notches on the pencil.

    • Make V-notches on the pencil maintaining the distance of 1 cm gap between the notches.

    • Learn these variations, by going to Pencil Spinner (Variations)

Finish Line

One other person completed this guide.

Madhushree HS

Member since: 05/02/2017

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