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Homework Help: Finding the coefficient of kinetic friction

  1. Oct 14, 2008 #1
    1. The problem statement, all variables and given/known data

    A 50 kg block slides down a 32° ramp with an acceleration of 3.2 m/s2.
    What is the coefficient of kinetic friction between the block and the ramp?

    2. Relevant equations
    [tex]\mu[/tex]kinetic=[tex]\frac{f_{kinetic}}{F_{normal}}[/tex]


    3. The attempt at a solution

    I have gone through many attempts, but all of them just don't seem right...could someone please explain it plain and simple?
     
  2. jcsd
  3. Oct 14, 2008 #2

    nicksauce

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    Science Advisor
    Homework Helper

    Hi physics_fool, welcome to PF. The usual algorithm for solving such problems is:

    1) Draw a free body diagram, identifying the forces. There should be weight, friction, and normal force.
    2) Use Newton's second law, F=ma, to find the force of friction
    3) Use Force of friction / Normal Force = coefficient of friction

    So what are the components of the forces in each direction?
     
  4. Oct 14, 2008 #3
    That's the question as it was given...

    but for your second question, isn't that to find the net force...not the force of friction?
     
  5. Oct 15, 2008 #4
    Ok...nvm. I got it...thanks anyways:smile:
     
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