1. The problem statement, all variables and given/known data The diagram (not included) shows a straight, horizontal swimming bath spring board of length 4m and weight 300N. It is freely hinged at A and rests on a roller at B where AB=1.6m. A boy of weight 400N standard at end C. a) show directions of forces acting on A and B b) calculate magnitudes of forces at A and at B 2. Relevant equations A______________B______________C AB= 1.6m BC= 2.4m AC= 4m 3. The attempt at a solution Weight of board put at centre point (0.4m from B and 2m from C) RA assigned as reaction force at A RB assigned as reaction force at B RA = 700-RB RA+RB = 700N (300x2)+(4x400)=RA+(RBx1.6) 2200=RA+(RBx1.6) 2200=700-RB+(RBx1.6) 1500=0.6RB 2500=RB This figure for RB simply cannot be right and therefore really isn't helping me!