1. The problem statement, all variables and given/known data Assume that the pin joints at A,E, and F, are attached to the rest of the truck body, which is not shown. If a 8-kN weight is concentrated on the fork as shown, find the forces that the pins on member CDE experience. All joints can be modeled as pins. 3. The attempt at a solution My question is only about the FBDs that I have so far. I see that both members AB and DF are two-force members, meaning the forces in them have the same magnitude, same line of action, and opposite direction. So member AB should have two forces, one pointing up and one pointing down. I just don't see how FBC comes into the picture, since it has both X- and Y-components... Any hints would be greatly appreciated.