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Derivation for Friction in Brakes

  1. Oct 21, 2009 #1
    1. The problem statement, all variables and given/known data
    Derive the expression for frictional resistances in block brakes.Use standard symbols to denote required parameters.


    2. Relevant equations



    3. The attempt at a solution
    My actual problem is the fact that I have checked 2 reference books, both have derived the expression assuming the friction produces a torque in the same direction of rotation of the drum.There is no explanation why this has been done.
    If these 2 forces(friction and force of rotation) were to produce torque in the same direction then I suppose the drum should never stop its rotation, so what is the actual derivation with explation?
    Kindly Help..
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Feb 11, 2010 #2
    I have got the answer to my question.
    Thank You Physics Forums.
     
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