What is the total summation of moments at A ?

Aug 2014
507
1
India


What is the total summation of moments at A?

I tried \(\displaystyle \sum M_{A} = F.(d+d` )-F(d+d` )-F.d\)

I am getting negative answer.
 

skipjack

Forum Staff
Dec 2006
21,493
2,476
Any force acting through A has a zero moment at A.

Did you intend the leftmost force to be -F rather than F? If it's -F in the downwards direction, it's equivalent to F in the upwards direction.
 

skipjack

Forum Staff
Dec 2006
21,493
2,476
The arrow shows the force is acting downward, so the magnitude would be F, not -F.

Is the answer F·d intended to be correct?