1. The problem statement, all variables and given/known data I don't really understand how to determine the forces in a pulley system. Like in this picture : http://postimg.org/image/4vxrf59ar/ [Broken] How do you decide what forces are present for the pulley? Why isn't there a 375lb on the right side as well? What would be the pulley forces at H? Also, why does that 375lb affect the member BFG?