Engineering Statics

C-2


Determine the magnitude of the couple generated by the forces shown.

We will sum the moments about point A...
the y component of the 32 pound force at 8 feet,
the x component of the 32 pound force at 6 feet,
and the -5 ftlb moment.
We calculate that the moments about point A is -227 lbft.
Similarly, we determine the sum of moments about point B.
We can see that it is the same as about A.
Examinig point D, we calculate the sum of moments...
...and see that it is the same as moments from the other two points.