Friction

Which of the following situations in which friction is helpful?

• Brakes used on a bike.

• Tread on the bottom of your shoes.

• Tires from a car on the road.

• All of the above

Friction is a force that acts in an ___________ direction of movement.

• similar

• opposite

A type of friction that occurs when air pushes against a moving object.

• surface area

• gravity

• air resistance

• water resistance

Why is it important for basketball players to wear shoes with tread when playing?

• to increase the speed of the player

• to increase friction between the floor and the player’s shoes

• to decrease the amount of force needed for the player to move

• to decrease the force between the player and the floor

What force helps to slow down a moving roller coaster?

• Friction

• Lubricant

• Magnetic

• Polishing

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How can we reduce friction?

• streamlining

• rough surface

• press the two surfaces harder

• remove the lubricant

Which of the following situations in which friction is harmful?

• Using an eraser to erase marks

• Pencil marking on paper

• sand placed on ice in the winter

• Engine parts wearing out

Which of the following shows the direction of the friction force?

• A

• B

• C

• D

Tags

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There is a less friction between _________ surfaces.

• rough

• smooth

• sticky

• bumpy

Friction does not depend on the weight (mass) of a moving object.

• True

• False

Tags

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