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Unformatted text preview: The Simple Pendulum An application of Simple Harmonic Motion A mass m at the end of a massless rod of length L There is a restoring force which acts to restore the mass to =0 Compare to the spring F s =kx The pendulum does not display SHM m T mg sin mg F = mgsin L But for very small (rad), we can make the approximation ( <0.5 rad or about 25) simple pendulum approximation L mg k kx F s L mg L s mg F L mg F s = = = = = = = ) ( r s since sin Arc length Looks like spring force Like the spring constant This is SHM Now, consider the angular frequency of the spring L g f L g m L mg m k 2 1 / = = = = = Simple pendulum angular frequency Simple pendulum frequency With this , the same equations expressing the displacement x , v , and a for the spring can be used for the simple pendulum, as long as is small For large, the SHM equations (in terms of sin and cos) are no longer valid...
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 Fall '11
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 Force, Mass, Simple Harmonic Motion

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