The normal force is the force exerted by a surface on an object in contact with it. It acts perpendicular to the surface and prevents the object from passing through the surface. The magnitude of the normal force often equals the component of the object's weight that is perpendicular to the surface, but this isn't always the case; it depends on other forces acting on the object.
Understanding the normal force is crucial in solving many physics problems, especially those involving inclined planes and static equilibrium. The normal force adjusts itself based on applied forces to maintain the object's position relative to the surface.
Match the term with its definition:
| Term | Definition |
|---|---|
| 1. Normal Force | A. The force that opposes motion between surfaces. |
| 2. Weight | B. The force exerted by a surface on an object in contact with it, perpendicular to the surface. |
| 3. Friction | C. The force due to gravity acting on an object. |
| 4. Applied Force | D. A force that is directly exerted on an object. |
| 5. Equilibrium | E. A state where the net force on an object is zero. |
The ________ force is a contact force that acts ________ to the surface. It is often equal to the ________ of an object, but can be affected by other ________ forces. When an object is in ________, the net force is zero.
Explain, in your own words, why the normal force is a reaction force and provide an example of when the normal force is NOT equal to an object's weight.
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