Music for leaning: sound box

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Make your own sound box and explore the world of sound waves. Many kids end up playing with this experiment and don’t even realize they are learning all about sound.

Put the elastics around the box.

Use your finger to pluck each elastic. Listen to the different sounds.

Use the fingers of one hand to stretch one of the elastics. Pluck the elastic. Does it change the note?

Arrange the elastics in sequence from the highest note to the lowest note. Can you figure out why this sequence works?

Note: you may need to tape the small piece of cardboard to the bottom and sides of the box to strengthen the sides.
What Should Happen
The elastics vibrate when they are plucked. Both the object that is vibrating, and the tension will change the sound. Wide elastics usually vibrate slower, so they create low notes. Thin elastics vibrate faster to create higher notes.
A loose elastic will vibrate more slowly (creating a lower note) than a tight elastic that is the same width. That’s why stretching the elastic changed the sound.


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