Friction Quiz

What is friction?

• Friction is the force that opposes the motion of an object when it comes into contact with another object or surface.

• Friction is the force that causes objects to repel each other when they come into contact.

• Friction is the force that assists the motion of an object when it comes into contact with another object or surface.

• Friction is the force that only affects objects in motion and has no effect on stationary objects.

Name the three types of friction.

• internal friction, external friction, and gravitational friction

• static friction, kinetic friction, and rolling friction

• sliding friction, magnetic friction, and electrical friction

• fluid friction, surface friction, and air friction

Which type of friction occurs when an object is not moving?

• Kinetic friction

• Rolling friction

• Fluid friction

• Static friction

Which type of friction occurs when an object is rolling?

• Rolling friction

• Fluid friction

• Kinetic friction

• Static friction

Which type of friction occurs when an object moves through a fluid?

• liquid friction

• air friction

• gas friction

• fluid friction

What are the factors that affect friction?

• Nature of surfaces, force pressing surfaces, presence of lubricants or contaminants

• Temperature, speed, weight

• Time, distance, volume

• Color, shape, size

Which factor affects friction by increasing it when the surfaces are rough?

• Weight of the objects.

• Temperature of the surfaces.

• Roughness of the surfaces

• Smoothness of the surfaces.

Which factor affects friction by increasing it when the surfaces are pressed harder together?

• normal force

• velocity

• surface area

• frictional force

Which factor affects friction by reducing it when a lubricant is used?

• Temperature

• Surface roughness

• Friction coefficient

• Lubricant

True or False: Friction always opposes the motion of an object.

• False

• Friction has no effect on motion

• Friction can sometimes assist the motion of an object

• True