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The normal force is the perpendicular contact force exerted by a surface on an object resting on it. It counteracts the weight of the object.
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Gravitational Force: The attractive force exerted by Earth on an object, directed towards Earth's center.
Frictional Force: The resistive force that opposes motion between two surfaces in contact.
Inclined Plane: A flat surface tilted at an angle used to demonstrate effects of forces, including components of gravity and normal forces.