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Applied force homework

  1. Oct 15, 2007 #1
    1. The problem statement, all variables and given/known data
    A horizontal force of 50 N is required to pull and 8.0 kg block at a unifrom velocity across a horizontal wooden desk. Determine the coefficient of kinetic friction.


    2. Relevant equations
    [tex]F_{Net}[/tex]=ma


    3. The attempt at a solution
    I put [tex]F_{Net}[/tex] as 0, because accleration is 0. By doing this, I get the applied force and the force of friction both as 50, but I don't think that its right. By the way, the answer to the question is 0.64.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 15, 2007 #2
    You are correct in finding that the force applied is equal to the kinetic friction, but you need another formula to relate the frictional force to the coefficient of friction.
     
  4. Oct 15, 2007 #3
    What would that formula be?
     
  5. Oct 15, 2007 #4
    Friction Force = (Coefficient of friction)*(Normal force)
     
  6. Oct 15, 2007 #5
    Thanks for the formula, I got the answer.:smile:
     
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