Describe the difference between the normal force and gravitational force in terms of direction and origin.

Describe the difference between the normal force and gravitational force in terms of direction and origin.

• A. Weight is due to gravity acting downward; the normal force is a contact force exerted by a surface perpendicular to the surface to support the object
• B. Weight is a contact force; normal force is gravity
• C. Weight is the reaction force from acceleration; normal force is due to inertia
• D. Weight equals frictional force; normal force equals applied force

Answer: (A)

Gravity is the downward pull from Earth's mass, a field force that acts on the object's weight regardless of surfaces. The normal force, on the other hand, is a contact force that arises when the object touches a surface; it acts perpendicular to that surface, pushing the object away from it to prevent penetration. This means gravity tends to pull straight down, while the normal force points perpendicular to the surface (often upward on a horizontal surface, or perpendicular to an inclined plane). The normal force’s existence and magnitude depend on contact, and it adjusts to balance the perpendicular component of other forces to keep the object from sinking into the surface.

Gravity is the downward pull from Earth's mass, a field force that acts on the object's weight regardless of surfaces. The normal force, on the other hand, is a contact force that arises when the object touches a surface; it acts perpendicular to that surface, pushing the object away from it to prevent penetration. This means gravity tends to pull straight down, while the normal force points perpendicular to the surface (often upward on a horizontal surface, or perpendicular to an inclined plane). The normal force’s existence and magnitude depend on contact, and it adjusts to balance the perpendicular component of other forces to keep the object from sinking into the surface.