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Frictional forces.

  1. Jan 9, 2005 #1
    Where does the equation F (force of friction) = uN (Muu times normal force)
    come from? How do you derive the u?
  2. jcsd
  3. Jan 9, 2005 #2
    derive? it is a property of substance.... the easiest way is doing an experiment....
  4. Jan 13, 2005 #3
    It comes from a good sounding phrase:

    "The force of friction is proportional to the normal force"

    This is translated in to f = mN.

    It isn't really worth anything to anyone, other then to show introductory students how complex phenomena can begin to be model. It is semi valid as a engineering rule, and good for teaching.
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