Si system, the normal force in newtons (N ) is a mechanical quantity. The concept of the normal force is needed to determine the strength of the materials, to find out the cross-sectional tension level. In connection with the normal friction force, it is the component, perpendicular to the surface (surface being a plane) of contact, of the contact force exerted on an object by, for example, the surface of a floor or wall, preventing the object to fall.

 

Of the different load types, the following types generates the so-called nominal force

1.  Pulling, where the force resistance demands pulling strength of the material.
     - normal force, perpendicular force against the reviewed surface
     - the pulled body may be long, the cross-sectional stress level determines the force
     - the force gets the nominal value of 1

 

2.  Compressing, where the force resistance demands compressing strength of the material.               - normal force, perpendicular force against the reviewed surface
      - the rod is short enough, the tension level determines the amount of force
      - the rod is long enough, buckling determines the amount of force
      - the force gets the nominal value of 1