Grade Level: Preschool to 2nd grade; Type: Physics
Chidren will experience sounds travelling through things in different states: a bag of air, a bag of water, a wooden block.
Will a pencil tap heard through a bag of air sound different than a pencil tap heard through a bag of water? Will these taps sound different than a tap heard through a wooden block?
- Zippered sandwich bag
- Wooden block
- Blow into the sandwich bag and quickly seal it to create a puffed up bag of air (a gas).
- Cover one ear with your hand and the other ear with the bag of air.
- Have an assisstant tap the bag with a pencil. How does it sound?
- Now fill the bag with water (a liquid) and seal it.
- Hold this water-filled bag against one ear while covering the other ear with your hand.
- Have your assistant tap this bag with a pencil. How does it sound?
- Finally hold a wooden block (a solid) over one ear while covering the other ear with your hand. Have your friend tap the block with the pencil. How does it sound?
- Compare and discuss your observations.
Terms/Concepts: Things exist in different states: gas, liquid. solid; Sound travels.
References: "How to Demonstrate Sound Waves to Kids," eHow Family
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