# Homework Help: Forces in equilibrium

1. Oct 15, 2016

### chetzread

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. Oct 16, 2016

### chetzread

Which part of my working is wrong ?

3. Oct 17, 2016

### PhanthomJay

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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