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Static Equilibrium On a Beam Question

  1. Apr 9, 2012 #1
    1. The problem statement, all variables and given/known data

    A uniform beam of length L and mass m shown in the figure below is inclined at an angle of θ to the horizontal. Its upper end is connected to a wall by a rope, and its lower end rests on a rough horizontal surface. The coefficient of static friction between the beam and surface is μs. Assume the angle θ is such that the static friction force is at its maximum value.

    (e) What happens if the beam is lifted upward and its base is placed back on the ground slightly to the left of its position in the figure above?

    Picture: http://www.webassign.net/serpse8/12-p-016.gif

    2. Relevant equations

    N/A

    3. The attempt at a solution

    I figure out most of the question, but I am having trouble with part e. I guess I just need clarification on the vocabulary. Would the beeam slip since it does move to the left or does it stay stationary because the person moved it to the left? Can anyone help? Thanks.
     
  2. jcsd
  3. Apr 9, 2012 #2

    gneill

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    Staff: Mentor

    Assume that the person places it carefully so that it is not in motion before he lets go. The question then is, will the beam start to slip in its new position or will it remain in place?
     
  4. Apr 9, 2012 #3
    If the person places it so carefully, then is it safe to assume that the beam will remain stationary?
     
  5. Apr 9, 2012 #4

    gneill

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    Staff: Mentor

    Nope. That will depend upon the sum of the forces acting.
     
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