1. The problem statement, all variables and given/known data A 63lb force F and 560lb in couple M are applied to corner A of the block shown. Replace the given force-couple system with an equivalent force-couple system at corner D 2. Relevant equations 3. The attempt at a solution I actually solved the problem but I had to guess and check. I am not sure why it works the way it worked so I was hoping somebody could explain this to me. First i found the components of M. then I found the components of the Moment created by F by doing A X F. I called this M1 Then I put the same force at point D and did D X F giving me M2 in order to find the answer I had to do M - M1 + M2. Can someone explain why I had to do M - M1 + M2?