SOUND LIKE A CHICKEN!
Have fun with your friends and family when you construct this little device that sounds just like a chicken.
This is also a good example of how sounding boards work.
The cup makes the vibrations louder, while the wet paper towel provides friction to create the sound.
YOU WILL NEED:
* A plastic drinking cup
* Yarn or cotton string (nylon string will not work well)
* 1 paper clip
* Paper towel
* A nail
WHAT TO DO:
1. Cut a piece of cotton yarn about 20 inches (40 cm) long.
2. Use the nail to punch a hold carefully in the centre of the bottom of the cup.
3. Tie one end of the yarn to the middle of the paper clip.
4. Push the other end of the yarn through the hole in the cup and pull it through as shown in the picture.
5. Get a piece of paper towel about the size of a ladies handkerchief, then fold it twice and get it damp in the water.
6. Now it's time to make some noise!
Hold the cup firmly in one hand, and fold the damp paper towel around the string near the cup as in the picture.
While you squeeze the string pull down in short jerks so that the paper towel tightly slides along the string.
If all goes well - you hear a chicken!
There are lots of ways of decorating your plastic cup....
Sound is produced when an object vibrates.
The object can be anything, vocal cords, the strings inside a piano, the bottom of a pot, or someone whacking a rock under water.
If it vibrates and connects to anything solid, liquid or gas, it will vibrate.
In this case the plastic cup acts as a loudspeaker.