Which of the following is correct relation between shear force (F) and bending moment (M)?

Explanation:

a) In a bending beam, a point of contra flexure is a location where the bending moment is zero (changes its sign). In a bending moment diagram, it is the point at which the bending moment curve intersects with the zero lines.

• At the point of contra flexure, the bending moment is zero.

​b) The rate of change of bending moment at any section is equal to the shear force at that section.

c) The rate of change of shear force at any section is equal to load intensity at that section.

d) For bending moment to be maximum or minimum, shear force should change its sign.