Friction Review

Which of the following is the force that opposed motion between two surfaces that are in contact?

• gravity

• friction

• magnetic

• electrical

What is the motion of a rolling ball when it encounters a frictional force?

• The ball's speed will increase

• The ball's speed will decrease

• The ball's speed will not change

• Not enough information to determine

Tags

NGSS.MS-PS2-2

NGSS.MS-PS3-5

Which of the following results in a decrease of friction?

• applying more force when scrubbing a dirty pot

• oil added to a car engine to lubricate moving parts

• deep tread on snow tires to increase traction

• scrubbing food from a dish with the rougher side of the sponge

Which of the following results in a helpful increase of friction?

• sandpaper used to smooth the surface of wood

• wax applied to wooden skis to make them slide more easily

• sand applied to a slick sidewalk to prevent someone from sliding

• rollers on the bottom of a chair to make it easier to move

When a mover puts furniture on a dolly with wheels, which type of friction is the mover using to make his job easier?

• static friction

• sliding kinetic friction

• fluid friction

• rolling kinetic friction

Imagine a soccer ball is kicked into the air by a player. After it hits the ground, it rolls a long way and then stops. Why doesn't it continue to roll forever?

• Friction will increase the speed of the ball

• Friction eventually stops the ball

• The ball overcomes the forces of friction

• The ball will continue to roll forever

Tags

NGSS.MS-PS2-2

What factors affect the amount of friction between surfaces?

• the roughness of the surfaces and the surface area

• the surface area and the force pushing the surfaces together

• the force pushing the surfaces together and the roughness of the surfaces

• the volume and surface area of the objects in contact

What type of friction is present between your bike tires and the road?

• sliding friction

• rolling friction

• fluid friction

• static friction

What kind of friction does a parachute experience with the air?

• sliding friction

• rolling friction

• fluid friction

• static friction

Check ALL of the helpful uses of friction

• wears away surfaces

• prevents slipping

• allows objects to move

• controls motion