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Homework Help: Bending diagram, answers don't match book

  1. Mar 23, 2012 #1
    1. The problem statement, all variables and given/known data

    2. Relevant equations
    moment = force x distance

    3. The attempt at a solution
    on sheet.

    According to the book, the max moment is 5.6 kN (at a distance of 2.4 m from point A), which was my calculation before adding the force at A (.8 kN upward)

    whats wrong?
  2. jcsd
  3. Mar 23, 2012 #2


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    Gold Member

    When you summed moments about point A = 0, you calculated the moment of the distributed load as (8 kN)(4m) = 32 kN-m, but the moment arm (perpendicular distance) of the resultant of the distributed load is not 4m (the resultant of the distributed load acts at its center of gravity).
  4. Mar 23, 2012 #3
    Could you post the original question? The general shape of your graph looks right, but I'm not certain what the value of that distributed load is suppose to be.
  5. Mar 23, 2012 #4
    the value of the distributed load is 2 kN per meter
  6. Mar 23, 2012 #5
    wow. You're right phantom, was a basic error on that one.
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