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Friction and acceleration

  1. Nov 7, 2013 #1
    1. The problem statement, all variables and given/known data

    Hello. I am working on a physics lab where we pushed a wooden block (weighed at 255.2 g) towards a motion detector. Through this we were able to determine its acceleration.

    After five trials we repeated the experiment, but with an additional 500 g weight on top.

    From this data I need to find the coefficient of kinetic friction.

    2. Relevant equations

    f = (u_k)N = (u_k)mg

    3. The attempt at a solution

    I know mg, but I don't know the frictional force or u_k. Only one of these have to be known, but I'm not sure how to get there using the acceleration of the block.
  2. jcsd
  3. Nov 7, 2013 #2
    ma = (u_k)mg

    Can I just say:
    a = (u_k)g ?
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