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Box sliding on incline with friction

  1. Jan 20, 2010 #1
    1. The problem statement, all variables and given/known data

    How to find the uk of a box sliding down a hill with only an angle and acceleration

    Given: angle= 30 acceleration= 3.1 m/s2
    2. Relevant equations

    1. uk= fk/fn 2. f=ma

    3. The attempt at a solution

    i did the cosine of my angle but i am not sure that is the answer
     
  2. jcsd
  3. Jan 20, 2010 #2
    Re: Friction

    Have you done free body diagrams where you "break" the force due to gravity up into two components? One of the components is opposite the normal force, and the other is directed down and parallel to the hill...?
     
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