1. The problem statement, all variables and given/known data Problem 10.36 The bar has cross-sectional areaAand modulus of elasticity E. If an axial force F directed toward the right is applied atC, what is the normal stress in the part of the bar to the left ofC? (Strategy: Drawthe free-body diagram of the entire bar and write the equilibrium equation. Then apply the compatibility condition that the increase in length of the part of the bar to the left of C must equal the decrease in length of the part to the right of C.) SEE ATTACHED PDF 2. Relevant equations sum of forces =0 Young's modulus definition for compatibility of deformations 3. The attempt at a solution Solution is already in the pdf, I just don't understand why the reactions (normal forces) on the bar are both to the left. Normals are supposed to go towards the body. However, if I were to take the left reaction force going to the right (where I think it should point) the solution would be negative. Same happens with other lecture notes (page 6 here http://www.yamnuska.ca/student/smtl/notes/StaticIndetermW06.pdf ) . What am I doing wrong?