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What is the role of the normal force when an object is resting on a horizontal surface?

It opposes the motion of the object.

It accelerates the object horizontally.

It supports the object against gravity, preventing it from falling through the surface.

It provides tension in the object.

Which force is responsible for the motion of a car accelerating on a road?

Tension.

Gravitational force.

Frictional force.

Drag.

Which of the following is true about free-body diagrams?

They show the motion of the object.

Both A and C are true.

They are used to represent the forces acting on an object.

They represent only the external forces.

What is the unit of weight?

Meter (m).

Kilogram (kg).

Joule (J).

Newton (N).

In a free-body diagram, what does the length of an arrow represent?

The velocity of the object.

The mass of the object.

The force acting on the object.

The displacement of the object.