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Static Friction Coefficient Problems

  1. Feb 27, 2013 #1
    1. The problem statement, all variables and given/known data
    There are 2 questions in the attachments both with the same scenario I'm having troubles with.


    2. Relevant equations

    f=ma

    3. The attempt at a solution
    I tried finding the budging force between the 2 masses and that was about 4. I don't know where to go from there to find the acceleration.
     

    Attached Files:

  2. jcsd
  3. Feb 27, 2013 #2

    rude man

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    Afraid I'm no help since I picked an answer for part 1 which does not correspond to any of the choices for answers in part 2.

    Anyone else?
     
  4. Feb 27, 2013 #3
    there is still one answer choice that isn't shown. couldn't get it in the screen shot
     
  5. Feb 27, 2013 #4
    What was the last answer choice? (for both problems)

    You've already worked out the maximum frictional force that can be on the 2kg object - 4N.
    Since this is the only horizontal force on the object, then this is also the maximum net force on it.
    So, just use F=ma to get the maximum acceleration.

    ( If this is not the hidden answer, then I will have to rethink it ).
     
  6. Feb 27, 2013 #5

    rude man

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    But 4N is not the F shown on the picture. (I agree it's the force on the 2 kg block.)

    I picked one of the visible answers for part 1 but not for part 2 so my hope is for the remaining choice of part 2 to be my answer.

    We need those last two answers jklops!
     
  7. Feb 27, 2013 #6

    haruspex

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    ap123 wrote that his / her answer for the acceleration corresponded to a force of 4N on the top block.
    jklops686, what do you get for F?
     
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