1. The problem statement, all variables and given/known data why at C . the shear force V change from -0.5 to 0.5 ? We wantg to determine the shear force at different location , and a unit force is applied at arbitary location ( measured from A) ... 2. Relevant equations 3. The attempt at a solution IMO , there's no upwards force of 1 acting exactly on C , so the shear force will decrease from -0.5 at C to the cantilever end .