If you impart randomly timed pushes to your friend, you are unlikely to get her moving very much. Imagine pushing a friend on a swing: after one big push, the swing slows down, but continues oscillating for a while with a given frequency. This is an example of a driven oscillation.
If you can do this with sufficient volume, the glass will try to move in its vibration farther and faster than the material in the glass is able to move, and the glass will break under the strain. If you can match the pitch of your voice to the resonant frequency of the glass the vibrating air will start the glass vibrating too.
#GLASS SHATTER SERIES#
Your voice is also a series of air pressure waves, with the pitch related to the frequency of the waves, and the volume related to the amplitude of the waves. The sound gradually gets quitter and dies out as the amplitude of the vibrations diminishes due to energy being carried away by the sound waves. If you flick a crystal wine glass with your finger, you will hear a fairly clear tone as the glass vibrates, causing waves of air pressure to emanate out from it, which your ears and brain interpret as sound.
I HIGHLY recommend asking a teacher about this, since doing experiments with crystalware at home is not likely to win much support whoever owns the crystal.įrank DiBonaventuro, B.S., Air Force officer, Tinker AFB, OK.Īny physical object has frequencies at which they naturally vibrate, known as resonance frequencies. When the sound gets too loud for the glass to vibrate, it shatters the glass. To break the glass, you need to broadcast not only a sound that is *just* the right frequency, but also has a high enough amplitude (loudness) to exceed the strength of the glass to resist those vibrations. If you generate a sound that is the same frequency the glass resonates at, after you turn off the sound, the glass will hum a little, much like a pitchfork. The glass hums (and doesn't shatter) because the amplitude of the waves (the actual physical displacement that creates the sound) is not sufficient to surpass the strength of the glass. Waves of any sort set up sympathetic vibrations in the materials they impinge upon, which is the principle behind many many things, including telephones and radar. Your finger will vibrate on the glass, and once you get it right and consistent, the glass will 'hum'. Try getting a crystal wineglass, dipping your finger in water, and rubbing it gently around the rim of the glass. Crystal, resonates all at one particular harmonic frequency. First off, the glass in question needs to be crystal, not just any glass. What is the physics involved with breaking glass with your voice?Īnswer While breaking glass with sound is an interesting trick, it really takes a lot of effort to get the job done.
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