Shear force and bending moment diagram.

Question

Accepted Answer

Shear force and bending moment diagram are graphical representations of internal forces in a beam.

Shear force diagram shows the variation of shear force along the length of the beam.
Bending moment diagram shows the variation of bending moment along the length of the beam.
Shear force is the algebraic sum of all the vertical forces acting to the left or right of a section.
Bending moment is the algebraic sum of all the moments to the left or right of a section.
Shear force changes sign at point of load application while bending moment changes slope.
These diagrams are useful in designing and analyzing beams and determining their maximum load capacity.