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Could someone help me with my hw problem?

  1. Nov 11, 2012 #1
    http://imgur.com/bayjp I just need some clarification, the answer I got was 24.01, because the box is not moving, meaning a = 0, therefore 0 = Fa - Ff, I know Ff = (Mew x Fn), Mew = 0.245 and Fn = 98N, (I did 1 FBD of the sum of all masses). Meaning 0 = Fa - (0.245 x 98) and I just rearranged the question to get my answer.
     
  2. jcsd
  3. Nov 11, 2012 #2

    Simon Bridge

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    What did your free body diagram look like?
    (Arn't there two friction forces?)
     
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