1. The problem statement, all variables and given/known data I feel that I am a bit fuzzy whether things are reaction forces. In the diagram I see there is a beam holding point B, and there are 3 forces: Cable BC, 500N, and 780N. My professor wrote: Ask yourself: is the beam holding the point from moving up or down, right or left? If so you will need to include the appropriate reaction forces in your FBD. To me, it is, as the beam is not hinged. Unfortunately I am not quite sure how to handle how to label the reaction force. Any advice would be great! 2. Relevant equations 3. The attempt at a solution My FBD is attached.