**Shear force**

It is a transverse
force, one part of the beam exerts on the other part at any cross section. It
is equal to the algebraic sum of all the transverse forces (including the
reaction) either to the left or to the right of the cross-section. In the case
of horizontal beams, shear force is the unbalanced vertical force on the left
or right side of the cross section.

**Bending moment**

It is the couple, one
part of the beam exerts on the other part, at a cross-section. It is equal to
the algebraic sum of moments of all forces (including that of reaction) either
to the left or to the right of the cross-section about the section. In the
other words, bending moment is the unbalancing moment of forces on any one side
of the cross-section considered.

Below diagrams explain the shear force and bending moment
diagram for Cantilever Beam.

**Concentrated load at the free end**

**Uniformly distributed load**

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