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Unformatted text preview: A Wiggle in Time The example of the weather vane. Something has come from the lamp through air, through the glass to set the vanes in motion. Strike the arm of a tuning fork and you will notice it vibrating back and forth. Something comes from that and is registered as sound. That something is energy . Explained in terms of waves. So how do we understand waves? Begin with SHM. 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) . x Right t Left Plot against time. Wiggles in Time!...
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- Winter '10