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Homework Help: Finding Magnitude

  1. Apr 7, 2015 #1
    1. The problem statement, all variables and given/known data
    Two blocks are stacked one on top of the other with mass m1 on top and m1/m2= 3.0. There is no friction between m2 and the ground, but the coefficient of friction between m1 and m2 are given by μk= 0.40 and μs= 0.50. For what magnitudes of force acting horizontally on m1 do the two blocks move together. (i.e. , no slide on one another), express answer as an inequality.

    2. Relevant equations

    3. The attempt at a solution
    i already written down all forces acting on both blocks but i am having issues finding the masses since m1/m2 = 3.0
  2. jcsd
  3. Apr 8, 2015 #2
    A classic. You have to show your work before anyone can help you. Also list the relevant equations.
  4. Apr 8, 2015 #3


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    Science Advisor
    Homework Helper
    Gold Member

    So write the masses as 3m and m, for some unknown m. Trust the question - the m's will cancel later.
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