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Force required to level out a bookshelf with weights on it

  1. Jan 14, 2008 #1
    1. The problem statement, all variables and given/known data

    Leif and Paige are rearranging the heights of their movable bookshelves; they remove one of the 2kg, 0.6 m long shelves by the two of them holding opposite ends. A 5.0 kg stack of books is piled up on the shelf 0.2 m from Leif. How much force must Leif and Paige each exert to hold the shelf level?

    2. Relevant equations

    F = ma

    3. The attempt at a solution

    F = 1 * 5 * 10
    F = 50 N up from Leif

    F = 10 N up from Paige

    I don't know how to calculate the mass in

    Help please, i need like step by step help please, i don't think very good thanks
  2. jcsd
  3. Jan 14, 2008 #2
    the system you describe is in static equilibrium.

    conditions for static equilibrium are:
    net force = 0
    net torque = 0

    there are four forces acting here, it will help to draw a free body diagram for this problem.
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