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Forces in equilibrium

  1. Oct 15, 2016 #1
    1. The problem statement, all variables and given/known data
    I couldnt get the forces in equlibrium in this question

    2. Relevant equations


    3. The attempt at a solution
    VA + VD = 35(3.5) + 10+15 = 147.5

    sum of moment about D = -35(3.5)(1.75+ 3.7) +15(1) + VA(3.5 + 1.7+ 2) = 0
    VA = 90.6upwards

    Sum of moment about C = -35(3.5)(1.75+1.7) +10(0.7) -VD(2) +15(3) =0
    VD = -185 ( downwards) ,

    So, VA + VD = -185+ 90.6 = -94.4

    So , VA + VD = 90.6 -185 = -94.4N , which is not 147.5N , which part of my working is wrong ?
     

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    Last edited by a moderator: Oct 15, 2016
  2. jcsd
  3. Oct 16, 2016 #2
    Which part of my working is wrong ?
     
  4. Oct 17, 2016 #3

    PhanthomJay

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    Science Advisor
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    Gold Member

    ok
    you forgot the contribution of the 10 kN load at 1.3 m from D
    you forgot he contribution from VA. It's best to sum moments about A.
    see above
     
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