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How i find friction between surfaces without using COF tester?

  1. Nov 27, 2012 #1
  2. jcsd
  3. Nov 27, 2012 #2


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    Staff: Mentor

    The angle of the book changed between sliding and the angle measurement.
    The method can give a rough approximation of the coefficient of static friction, but it should be done more carefully.
  4. Nov 27, 2012 #3
    Grat, you just (re)discovered the concept of "angle of friction".
    Used in intro labs to estimate static and kinetic friction.
  5. Nov 29, 2012 #4
    ya ...but this is just a illustration
    thanks for comments
  6. Nov 29, 2012 #5
    I will come back with come great videos ...
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