Friction Quiz

What is friction?

• A force that causes motion

• A force that stops motion

• A force that increases motion

• A force that opposes motion

Which of the following is a type of friction? (select all that apply)

• Static friction

• Kinetic friction

• Rolling friction

• Viscous friction

What is the general model of friction?

• A force that is equal to the mass times acceleration

• A force that is inversely proportional to the velocity

• A force that is a coefficient times the normal force

• A force that is proportional to the distance traveled

What happens to the energy of motion in the presence of friction?

• It is transformed into thermal energy

• It is transformed into potential energy

• It is transformed into kinetic energy

• It is transformed into electrical energy

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Which type of friction describes the friction between sliding surfaces?

• Kinetic friction

• Rolling friction

• Static friction

• Viscous friction

Which type of friction describes friction in wheels?

• Rolling friction

• Static friction

• Kinetic friction

• Viscous friction

Which type of friction describes the tendency of objects to stick to each other?

• Static friction

• Rolling friction

• Viscous friction

• Kinetic friction

What causes friction on a microscopic level?

• Electromagnetic forces between objects

• Atomic-scale attraction between adjacent particles of matter

• Gravitational forces between objects

• Nuclear forces between atoms

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What is the direction of friction forces?

• Irrelevant to the direction of motion

• Perpendicular to the direction of motion

• In the same direction as the motion

• Opposite to the direction of motion

How can friction be eliminated?

• By reducing the normal force

• By increasing the velocity of motion

• By increasing the coefficient of friction

• By eliminating the relative motion of matter