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An object that is in contact with a stable surface experiences a normal force that is always directed perpendicular to the surface. In the case of inclined planes, the normal force is directed perpendicular to the plane. The value of the normal force must be equal to the perpendicular component of gravity (see Math Magic section) so that there is a balance of forces along an axis perpendicular to the plane. Since the perpendicular component of gravity depends on the angle that the incline makes with the horizontal, the normal force must also depend upon the angle. Predicting how a change in the angle would affect the value of the normal force is a mere matter of thinking about the equation in the Math Magic section. If necessary, simply plug the two angle values into the Fperpendicular equation and compare the results.
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