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Homework Help: Newtons Law with friction

  1. Oct 1, 2005 #1
    I have a block conected to another block by a string in an inclined surface, with a frictionless pulley. Both blocks are the same weight so i already figure the acceleration of the object that its being pulled up.

    What I don't know is how can I calculate the minimum kinetic friction that will keep the system from accelerating.

    I tried setting the acceleration to zero for this formula:

    [Tex] a= 1\ frac{m2*g-m1*g*sin\theta - \mu*m1*g*cos\theta} {m1+m2} [\tex]

    after that i really don't get the answer. Please any sugestions.
  2. jcsd
  3. Oct 1, 2005 #2


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    Homework Helper

    Already answered in the other thread
  4. Oct 1, 2005 #3
    thanks fermat
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