Physics and Music Course Contribution Sample - Class Demo...

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Class Demo: The ViolinI felt that the section explaining the motion of a string being bowed (M.T.,pg.120) was rather unclear, particularly in the discussion of its relationship to moving andstatic friction. As for the diagram on the following page, it only increased my confusion.Now that I understand this process better, my objective is to clear up the role of frictionbetween string and bow by providing a better visual to understand it.I think that most people (who don’t play a string instrument or study physics)have something of an intuitive understanding of the fact that the bow is moving thestring, without necessarily understanding the mechanics of how it does so. After readingabout the properties of horse hair and rosin, I think most people can get as far asunderstanding how that would aid in the tendency of the bow and string to stick to oneanother (static friction), and consequently how the string would be dragged along as thebow moves up. After this point is where things seem to get a little foggy. The idea of thisdemo is to show how once the tension of the string overcomes the static friction and thestring breaks away, it slides down against the bow (moving friction) until a combinationof the friction slowing it down and the tension of the string (this time coming from theother direction) causes it to stop, and consequently stick, again.

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