1. The problem statement, all variables and given/known data http://imgur.com/BqIoe There is a 50 meter bridge with two supports. The bridge has a mass of 80000kg. A truck of 30000 kg is 15m from one of the supports. What are the forces acting on the ends of the bridge? Answers in back are F_a(support closer to truck): 598000 N and F_b: 480000 N 2. Relevant equations torque = Force_perpendicular * distance center of mass for uniform object is center of geometry 3. The attempt at a solution Sum of Forces in y direction on bridge: = -80000g - 30000g + Fn A + Fn B = 0 Torque @ A = -15(30000) - 25(80000) + 50*Fn B = 0 Fn B = 490000 Torque @ A = 35(30000) + 25(80000) - 50*Fn A = 0 Fn A = 305000 What am I doing wrong? Any help is appreciated.