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Normal Force Equation (Fn=Fgcosθ)

Definition

The normal force equation states that the normal force (Fn) acting on an object is equal to the weight of the object (Fg) multiplied by the cosine of the angle (θ) between the object and a horizontal surface.

Analogy

Imagine you are standing on a slope. The normal force is like your feet pushing against the ground to keep you from sliding down. The steeper the slope, the smaller your normal force becomes because it's harder for your feet to push against gravity.

Related terms

Weight: The force exerted by gravity on an object.

Angle of Inclination: The angle between a tilted surface and a horizontal plane.

Horizontal Surface: A flat surface parallel to the ground.

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AP® and SAT® are trademarks registered by the College Board, which is not affiliated with, and does not endorse this website.