Phys_151_PPL11

# Phys_151_PPL11 - A Wiggle in Time We have encountered-in uniform circular motion a trajectory of motion in which the object repeats the path it

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A Wiggle in Time We have encountered -in uniform circular motion- a trajectory of motion in which the object repeats the path it takes again and again. When it is pulled slightly to one side and released, a rock tied to a string and hanging from it swings to- and-fro in a small arc, also repeating its trajectory. This motion is periodic but not uniform circular. Notice that the path backtracks for half of its motion to the starting position before repetition occurs. It is an example of simple harmonic motion (or oscillatory motion) . U. C. M. S. H. M.

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Getting into the Swing of it Another example is an object hanging stationary at the end of a spring. Pull it down further and release it. The object moves up and down passing its original position “in rhythm”. These two motions are demonstrations of “wiggles in time” or vibrations . Such motions occur often enough in nature - in “bonded solids, when we were dealing with temperature e.g.-that there is good reason for us to try to
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## This note was uploaded on 08/31/2009 for the course DRXL 100 taught by Professor All during the Spring '09 term at Drexel.

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Phys_151_PPL11 - A Wiggle in Time We have encountered-in uniform circular motion a trajectory of motion in which the object repeats the path it

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