Vibration in matter is a repeated deviation about a mean point in either the mass or part of the mass of any substance. There is a constraining force pulling the vibrating substance back to its mean position and a stimulus responsible for the deviation. There are three possible scenarios for the duration and amplitude of the vibration depending on the stimulus. 1. If the stimulus occurs once only then the amplitude (strength) of the vibration will decrease over time because of friction or other energy loss. (e.g., a piano string or tuning fork). 2. Exactly repeated stimulus synchronised with the frequency of the vibration can overcome energy losses and maintain the vibration at a constant frequency and amplitude. (e.g., a quartz watch or radio oscillator). 3. Stimuli similar to (2) above but greater than losses will give positive feedback and cause the vibration to increase in amplitude[1]. This can eventually result in the vibrating object breaking. (e.g. marching boots on a bridge). https://youtube/watch?v=51VOHrxtlT0&index=16&list=PLBt3OR94jWPzTs8M5ZkN1xyuSv6fZ9rbE
Posted on: Thu, 04 Sep 2014 11:12:15 +0000
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