1. The problem statement, all variables and given/known data 2. Relevant equations M=r x F = d * F (for moment couple) 3. The attempt at a solution This is my attempt to the question, yet I have got quite a different answer from my classmates... (especially the moment by the 50N force couple) Can anyone point out is there anything wrong with my answer please? Moreover, I am not sure how to replace the moment with force couple... M=d*F, as no d and F given, are there many answers giving out the same moment? Thank you very much for any help!