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Three Children standing on a raft:Engineering Mechanics

  1. Oct 28, 2014 #1
    1. The problem statement, all variables and given/known data
    Three Children are standing on a raft 5x5m. If the weights of the children at Points A,B,and C is 375N,260N,and400N, respectively, determine the magnitude and the point of application of the resultant of the three weights
    Link to diagram:
    http://www.chegg.com/homework-help/...ter-3-problem-127p-solution-9780077275563-exc

    2. Relevant equations
    Sum of forces?

    3. The attempt at a solution
    So basically for this question, I'm stuck on the point of application part. The magnitude was easy enough, I just added all the forces. I'm not really sure how to approach the point of application part.
     
  2. jcsd
  3. Oct 28, 2014 #2

    Simon Bridge

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    The idea is to replace the three forces with an equivalent single force - one that has the same effect.
     
  4. Oct 29, 2014 #3

    rude man

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    Think of it like this: Pretend the resultant force lifts the raft above the surface of the water. At the resultant point the raft must not tip in any direction.
     
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