Shear force is the internal force that acts parallel to the surface of a material, causing it to slide or deform. In mechanical engineering and materials science, shear force is an important concept used to analyze the behavior of structures and materials subjected to lateral loads or forces. The formula for calculating shear force ($SF$) is,

Where:

• $SF$ is the shear force (in newtons, N).
• $M$ is the bending moment (in newton-meters, Nm).
• $x$ is the distance along the beam (in meters, m).