week 10b - Physics 1240 Thurs 3/17/2011 Today: Natural...

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Physics 1240 Thurs 3/17/2011 Today : Natural modes of vibration, percussion Last time : Stringed instruments Outline • “Slip-Grip” mechanism • Natural modes of vibration • Perceived pitch in percussion instruments • Analysis of a wineglass
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The Bowed String and the Stick- Slip Mechanism start at beginning ….bow ‘till a ….then slip back to c…. stick again
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Slip Stick
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CQ 10.4 True or False. During the fast slip-grip motion of the bowed string. The slip is a longer part of the cycle than the grip. A) True B) False
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Learning Goals for Natural Modes Know what might (or might not) exhibit natural mode vibrations Know when natural modes produce (or do not produce) a distinct pitch Know the difference between harmonic and inharmonic vibrations Be able to identify the missing fundamental – using virtual pitch
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Natural modes of vibration – that bend and spring back will exhibit natural modes of vibration Natural mode – the pattern of a particular vibration Natural mode frequency – the frequency that the particular natural mode vibrates at Partials = Natural mode frequencies
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week 10b - Physics 1240 Thurs 3/17/2011 Today: Natural...

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