A shear force diagram for a cantilever beam typically appears rectangular due to the constant shear force along the length of the beam. This is because the shear force remains unchanged until a point load is applied. In contrast, the bending moment diagram for the same cantilever will be triangular, reflecting the linear increase in bending moment from the free end to the fixed support. The relationship between shear force and bending moment diagrams is critical for understanding beam behavior. Overall, the shear force diagram is rectangular, while the bending moment diagram is triangular for a cantilever beam.
