Normal force
Normal force is the force that the ground (or any surface) pushes back up with; if there was no normal force, you would fall into the ground.

Normal force is the force that the ground (or any surface) pushes back up with; if there was no normal force, you would fall into the ground.
The normal force on a object is always perpendicular (at a right angle) to the surface the object is on.
On a flat surface, the normal force of an object is (the object's weight, that is its mass multiplied by the acceleration due to gravity). You might recognize this formula from the weight of an object, which is also . That is because the normal force and the downwards force often cancel each other out.
On an inclined plane, the normal force is reduced by the angle, and the normal force is .
Note that on a flat surface, (the angle) would be 0, and so would be 1. Thus, the two equations are equal.
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