Question

ABCD is rectangle, in which AB = CD = 100 mm and BC = DA = 80 mm. Forces of 100 N each act along AB and CD and forces of 50 N each at along BC and DA. Find the resultant moment of the two couples.​

Answer 1

Answer:

Skyli provides a workable method. I prefer a method easier to visualize:

2 x 100 x 40 N.mm + 2 x 50 x 50 N.mm = 13.0 newton.meters

as though the couple were acting through the centroid.