Water Whistle

My kids have recently taken on a new project - learning to whistle! While they quite haven't mastered the art of whistling yet, I thought it would be neat to introduce them to whistling with just a straw and a cup of water! We made this simple water whistle, and they've loved tooting along to their favorite songs.
How we did it:
Materials List
- straws
- cup
- water
- scissors
- tape - (optional)
- cardboard - (optional)
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Use scissors to make angled cuts on a straw.
Tip: Make sure the straw is still intact and that you're not cutting all the way through the straw.
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Optional: To secure the straw, cut a piece of cardboard into a right triangle. Match the right angle to where the straw folds and tape the cardboard onto the straw. Make sure the tape doesn't cover the open slit on the straw!
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We worked with different-sized straws to test out unique whistle sounds. What sounds can you make with your whistle?