Statics - Forces in a Truss 1. The problem statement, all variables and given/known data http://i.imgur.com/NbZlc.png 2. Relevant equations Equations of equilibrium (sum of the forces in all directions = 0, sum of the moments about an point = 0) 3. The attempt at a solution My attempt: http://i.imgur.com/qlLCY.jpg Hopefully you can read it. What I did is that I did the FBD of the entire system neglecting the internal forces, and I found the reaction forces. Then I did a FBD for joint A alone and solved for the two forces. Me and my friends are getting different answers so I just want to make sure. What I'm unsure about is my signs and the whole tension vs. compression thing. I don't understand it at all. Let me know where I went wrong (if I went wrong). Thanks! EDIT: I'm not really sure why this was moved to the engineering section, this problem is from my Statics course which is an introductory physics course (right?).