1. The problem statement, all variables and given/known data You are given truss ABC. In joint C there is a horisontal force F(13,2kN). a is the measurement between A and B, and b is the measurement between A and C. Calculate forces Nac and Nbc. 2. Relevant equations ƩMa=0 ƩFy=0 ƩFx=0 3. The attempt at a solution My main problem is that I don't see where to start in order to eliminate some of the unknowns. I first tried to calculate the angle at joint C by taking invers tan 2,8/5,4 - which gave me an angle of 44 degrees. I then looked at joint C and tried the method of joints. Which gave me: ƩFy= 0 --> -AC*sinv-BC*sinv=0 ƩFx=0 --->F-AC*cosv-BC*cosv=0 No way to eliminate unknowns, so no go. I then looked at the construction as a whole and started with calculating moment in A: ƩMa=0--> By*2,8=0 ƩFx=0 --> F-Ax+Bx...And I guess forces on the beams would come into play here as well, but that only gives me more unknowns. The same would happen with ƩFy=0, so I don't think this is the way to go either.