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Singing glasses demonstrates vibration and the sounds that come along with it. Its something fun to play around with and you learn along with it.
Introduction:
Materials:
Two wine glasses
Toothpick
Water
Procedures:
Fill both of the wine glasses with water half way only.
Hold the leg of the glass with one hand and dip your index finger of your other hand into the water.
Put your finger slightly on the rim of the glass, press down and rub it all the way around the rim without stopping. Keep going all around the rim of the glass while still giving pressure. That should make the glass sing.
Once you've made the glass sing, do the same thing with the other wine glass. You want the tone from each glass to be the same. This means that you will need to adjust the amount of water in each glass so that the tone is exactly the same.
Rest the toothpick on the rim of one of the glasses. Put the second wine glass close to the first one, but make sure they're not touching. Dip your finger in the water and make the glass without the toothpick sing, observe the toothpick carefully. The toothpick moves? how?
Scientific Principle: The physics principle behind "singing glasses" is that when the glass is making sound its is vibrating and the vibration caused by rubbing the wine glass with your index finger is called frequency. The faster the finger goes around and the lower the water it has. The more higher the pitch of the sound it is which also depends on the glass size and shape.
Safety Regulations: None because it can all be done at home with the simple materials.
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