A common implement used in the classroom to demonstrate the nature of the energy of sound waves is the tuning fork. When one tuning fork is struck against a surface, it produces an audible tone, the cause of which is the two prongs of the fork vibrating at a resonant frequency. When placed in close proximity to another tuning fork, the compressed air generated by the emerging sound waves causes the other tuning fork to vibrate as well. However, if you use a large scale tuning fork, you can cause other objects, such as toy cars, to move as well.
- Tuning fork hammer
- Smooth aluminum or ceramic surface
- Toy car
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Instructions
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1
Place the toy car on an aluminum or ceramic surface to eliminate the friction that will work against the car's wheels.
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2
Strike the prong of the tuning fork hard with the special hammer used to elicit tones from it. Place it close to your ear to ensure that it is producing a tone, indicating vibration.
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3
Place the prong of the fork as close as you can to the back of the toy car without touching it. If you have struck the prong hard enough, the compressed air generated by the emerging sound waves will cause the car to move forward.