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Finding the coefficient of kinetic friction given the masses of two connected objects

  1. Sep 21, 2009 #1
    1. The problem statement, all variables and given/known data
    Block A (M1-5 kg) is on a horizontal surface and block B (M2-2 kg)to the left resting on a 30 degree incline. the two are connected to each other by a mass-less rope over a massless pulley and are moving down hill (to the left) at constant velocity.

    a) Find the coefficient of kinetic friction assuming it is the same for both blocks.
    b) The tension of the rope


    2. Relevant equations
    fk=ukN


    3. The attempt at a solution
    I found -fk=M1*a and substituted that into the first equation of 5sin(30)-fk=ma. I'm not sure if I'm even starting this right or not, a gentle nudge in the right direction would be most appreciated.
     
  2. jcsd
  3. Sep 22, 2009 #2

    Redbelly98

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    Re: Finding the coefficient of kinetic friction given the masses of two connected obj

    You are omitting one of the forces acting on the mass. Did you draw a free body diagram ?

    Another hint: from reading the problem statement, we know that a=____?
     
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