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Newton's Forces - Friction

  1. Oct 17, 2007 #1
    1. The problem statement, all variables and given/known data

    What are the minimum and maximum values of m1 in the figure to keep the system from accelerating? Take µs = µk = 0.42.


    ________ kg < (or equal to) m1 < (or equal to) ________ kg

    2. Relevant equations

    F = m(a)

    3. The attempt at a solution



    Does Ff equal 49 since Fg of mass 2=49 and thus Ft must equal 49 so mass 2 doesn't move and then that means the Ft on the mass 1 also equals 49 so Ff must also equal 49??


    I get m=13.75 which is wrong. :(
  2. jcsd
  3. Oct 17, 2007 #2
    You didn't write the net force along the diagonal direction. If you did, you'd notice that something was missing.
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