Junior+Science+-+Straw+Whistle

=Make a Straw Whistle Duck Caller....= All sounds come from vibrations. Vibration is something that goes back and forth, back and forth. If something vibrates fast enough it will disturb the air. If the air vibrates, our ear drum picks up the vibration. An ear drum is a thin piece of skin inside your ear, stretched tight like a drum. It vibrates at the same rate as the original vibration. You hear this as sound. ||
 * [[image:straws.jpg width="236" height="179"]] || [[image:soundwave220.jpg width="273" height="174"]] || [[image:strawduck3zm5.jpg width="217" height="178" align="center"]] ||
 * [[image:youwillneed.gif width="177" height="66"]]
 * A straight drinking straw
 * A pair of scissors
 * Lots of puff!
 * Flatten the end of the straw
 * Cut a triangle at the end
 * Hold your lips tightly together.
 * BLOW! || [[image:howdoesitwork.gif width="192" height="66" align="center"]]

When you breathe hard through the straw, the air vibrates. This makes the little triangles you cut vibrate very fast against each other. The vibrations from your breath going through the straw make the duck sound. ||.
 * [[image:DSCF0496.JPG width="171" height="239" align="center"]] || [[image:DSCF0533-1.JPG width="280" height="237"]] || [[image:mallard_duck-flight.jpg width="246" height="239" align="center"]] ||
 * Try cutting the straw different lengths to see how the sound changes.
 * Which straw sounds most like a duck?
 * Fat straws or thin straws? Does the diameter of the straw affect the sound it makes?
 * [[image:chicken_cup.gif]] || =Go further......=

Make a Cheeping Chicken Cup

 * A plastic drinking cup
 * Yarn or cotton string (nylon string will not work well)
 * 1 paper clip
 * Paper towel
 * A nail
 * Scissors
 * Water

Follow[| this link] to find out how....
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