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EXPERIMENT 1 - Anil Kanungo(ASK 358 Partner Kristela Garcia...

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Anil Kanungo (ASK 358) Partner: Kristela Garcia PHY 115L – 60675 September 11, 2008 EXPERIMENT 1 – Vibrations of Strings [Introduction]: 1) Example A: some door stops, a diving board, etc Example B: a child on a swing set, child jumping on a trampoline, etc [Free Oscillations]: 1) Mode 2 will have the higher frequency because it must oscillate faster to generate such a mode, thus causing higher frequency. Every normal mode has its own set of frequencies that depend on its structure and composition. More peaks/valleys within a mode corresponds with higher frequencies. [Normal Modes of a Long Spring]: 2) Periods Time (s) Frequency (Hz) Wavelength (m) Fundamental 10 11.19 .894 3.68 First Harmonic 10 5.79 1.727 1.84 Second Harmonic 10 3.83 2.611 1.23 It is important that the equilibrium length of the spring does not change between these experiments because changes in spring length cause changes in wavelength, thus also affecting frequency. Stretching the spring farther or shorter causes changes in tension which, as we will see later, affects frequency especially. 3)
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EXPERIMENT 1 - Anil Kanungo(ASK 358 Partner Kristela Garcia...

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