SCIENCE ACTIVITIES FOR FUN!!!
Make a Whirling Wailer that never stops moving. You can keep it going by pulling on its
strings at just the right moment.
For this exercise you will need:
- a glass or cup
- a strong card or cardboard
- a bendy straw
- pencil or paper hole puncher
- Use the glass or cup to trace a circle about 10 cm across on the card. Cut the circle
out. This is your disk.
- Make eight big holes around the edge of the disk with the pencil or hole puncher. Put
two small holes on either side of the center of the disk.
- Thread the string through the two holes in the middle of the disk and tie the ends of
the string together.
- Hold the string in both hands. Swing the disk around to wind up the string.
- The disk whirls around as the string winds and unwinds. To keep the disk whirling, give
a quick pull with both hands just as the string winds right up to your fingers.
- Bend the straw. Then blow a stream of air onto the holes in the spinning disk. It makes
a strange wailing noise!
With each pull of the string, you add a force that speeds up the disk again.
The changing speed of the disk makes the sound go up and down like a wail.
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