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# Finding Normal Force

Normal force is that what acts perpendicular to any surface.Its an action-reaction force pair perpendicular to body weight mg.

It is denoted as Fn or N is the element, perpendicular to the surface of contact, of the contact force used by, for instance, the surface of a floor or wall, on an entity, preventing the entity from incoming the floor or wall. In a static state it is sufficient to poise the forces acting on the entity, like the force with which the entity pushes beside the surface and friction.

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## Normal Force Formula

If its an inclined plane as given in figure the angle $\theta$ measured from the horizontal surface.
N = mg cos $\theta$
Where N is the normal force, m is the mass of body,g is gravitational field strength, $\theta$ is the angle tending to be measured from horizontal.