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Newtons Laws - Coefficient of Friction problem

  1. Oct 5, 2011 #1
    1. The problem statement, all variables and given/known data
    330vazd.jpg






    3. The attempt at a solution
    I found the acceleration using kinematics equations.
    I don't know how to find the coefficient of friction though.
    I need help answering pard b c and d
    If you could give me the equations and explain.
    Just knowing how to do this one question will help me complete the rest of my homework!
    Thankyou
     
  2. jcsd
  3. Oct 5, 2011 #2
    Since you have a known acceleration and a known angle, you can find the difference between the calculated acceleration and the acceleration that would occur if there was no friction between the surfaces. That should help with all the remaining portions.
     
  4. Oct 5, 2011 #3
    what equation would i use then?
     
  5. Oct 5, 2011 #4
    So confused x.x
     
  6. Oct 5, 2011 #5
    If you draw a free-body diagram of the block on the ramp and use some trigonometry, you can figure out the forces that are acting on it. Try to find the components of the force due to gravity, and the normal force.
     
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