the force that a body exerts on another body at right angles to their mutual interface.

A force directed normal to the surface of a soil mass.

a force applied to a material (or structure) in a direction perpendicular to the surface; normal force can be compressive or tensile.

Angle of applied force in which the force is directed at approximately 90o to the platform of the core.

a contact force

a force perpendicular to the surface of contact (when two objects are touching)

In physics, the normal force F_n\ (or in some books N) is the component, perpendicular to the surface of contact, of the contact force exerted by, for example, the surface of a floor or wall, on an object, preventing the object from entering the floor or wall. In a static situation it is just enough to balance the force with which the object pushes, e.g. its weight on the floor, or a smaller force if somebody leans against a wall. If an object hits the surface with some speed, the normal force provides for a rapid deceleration, depending on how flexible the floor/wall is (and, of course, if it can provide enough force for braking instead of breaking).