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Help with Newton's Laws (AP Physics B)

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  1. Sep 13, 2011 #1
    1. The problem statement, all variables and given/known data

    they keep telling me it is a simple problem, ive actually done harder problems of the same thing, but i just dont seem to get this one.

    A 15kg block sits on a 25kg block. The coefficient of static friction between the blocks is 0.408 and there is no friction between the 25kg block and the floor. Find the maximum net force that can be applied to the 25kg blcok before the 15kg blcok begins to slide.




    2. Relevant equations

    sigmaF=a(sigmaM)
    fr=(mu)g

    3. The attempt at a solution

    I think i need to find out at which point the exerted force surpases the friction force (because it is what holds the 2 blocks together).

    This didn't work exactly how i wanted and it didn't give me the right answer.
     
  2. jcsd
  3. Sep 13, 2011 #2

    vela

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    What force causes the top block to accelerate? What's the maximum acceleration the top block can have?
     
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