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Homework Help: Rotational Dynamics HW Prob

  1. Dec 7, 2011 #1
    1. The problem statement, all variables and given/known data

    A uniform thin rod of weight W = 100 N is supported horizontally by two vertical
    props at its ends. At time t = 0 one of the these supports is kicked out. Find the
    force on the other support immediately thereafter.

    2. Relevant equations

    F1 + F2 = mg


    3. The attempt at a solution

    -F1(L) + 100N(L) = 0
    100N = F1

    seems too simple.. i dont understand what i did, i just plugged it into a formula i found in the book....
     
  2. jcsd
  3. Dec 7, 2011 #2

    PeterO

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    Homework Helper

    Once one support is kicked out it is no longer a stable/stationary rod.
     
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