Friday, August 3, 2012 5:05:51 AM
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Thursday, August 2, 2012 10:18:46 PM
A video is just series of still images at ~24 frames per second. If the exposure time for each image is short enough, it can freeze a moving object without blurring it. When the frame rate is near an even factor of the frequency of the vibrating string, it can appear to slow down or even stop. It's the same phenomenon seen in old western movies when the stage coach wheels appear to be turning backwards.