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Statics: Cylinder & Spring system

  1. Feb 21, 2008 #1
    1. The problem statement, all variables and given/known data
    The linear spring exerts a force at each of its ends that is proportional to the amount of stretch it undergoes. The spring modulus (proportionality constant) is 2 N/cm and its natural (unstretched) length is 1.5 m. Find the normal and friction forces (a) between cylinders A and B and (b) between B and the ground, if the weight of A is 500 N and that of each of B and C is 200 N.

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    2. Relevant equations
    Sum of moments = 0
    Sum of forces = 0
    fs = kx

    3. The attempt at a solution
    [tex]\Sigma[/tex]MAB = N(r/2) - fr(1+[tex]\sqrt{3}[/tex]/2) + fs(r/2)
    [tex]\Sigma[/tex]MBGround = (mg-N')(r/2) + f'r(1+[tex]\sqrt{3}[/tex]/2) + fsr

    Am I on the right track? I don't really know where to go from here. Please help! Thanks.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
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