Understanding Friction Pg. 17

What is friction?

• A force that helps objects move faster

• A material used to make wheels

• A type of energy

• A contact force that opposes motion

What happens when friction acts on a moving object?

• It becomes lighter

• It slows down or stops

• It changes color

• It speeds up

What does the amount of friction depend on?

• The weight of the objects

• The surfaces of the objects

• The size of the objects

• The color of the objects

Why is it easier to push a cart on smooth tiles?

• Smooth tiles are slippery

• Smooth tiles are sticky

• Smooth tiles are heavier

• Smooth tiles have less friction

What is needed to push a cart across an asphalt parking lot?

• Less force

• A special tool

• No force

• More force

Which surface produces more friction on the wheels?

• Asphalt

• Smooth tiles

• Water

• Glass

What is the effect of friction on a grocery cart?

• It slows down or stops the cart

• It makes the cart invisible

• It makes the cart fly

• It makes the cart heavier

Which of the following is NOT true about friction?

• Friction is a contact force

• Friction helps objects move faster

• Friction opposes motion

• Friction can stop a moving object