Answer:
the relation between load , shear force and bending moment is
shear force in a beam is calculated by the differentiation of the loading with respect to distance or length of the beam

Bending moment in a beam is define as the change of shear force diagram with respect to the length of the beam.

and where as
where V is the shear force , x is the distance in the beam , M is the bending moment and w is the loading on the beam.