Friction

The amount of friction depends on the weight of the objects pressing together.

• True
• False

Wesley is bored during class and begins rubbing his pencil eraser on the desk. He notices he created energy. What kind of energy can be created by rubbing an eraser on a desk?

• electric energy

• heat energy

• light energy

• magnetic energy

Which of the following is an example of friction that is helpful?

• Brakes used on a bike
• Tires from a car on the road
• Tread on the bottom of your shoes
• All are examples that are helpful

without friction, an object in motion would never stop

• true

• false

Haley is standing outside in the cold weather waiting for her bus. How can she create heat with her hands?

• Wave her hands in the air

• Rub her hands together

• Cover her hands in a towel

• Wash her hands with water

How does friction affect speed?

• more friction decreases speed
• more friction increases speed
• less friction decreases speed
• less friction doesn't affect speed

friction helps you write on a paper or black board.

• true

• false

Which of these actions would most likely make the most heat?

• Dragging a heavy box across the floor

• Letting ice cubes melt on a plate

• Growing plants in a sunny window

• Pouring water from one cup to another

you can walk because there is friction between your __________ and ______________

• ground and air

• feet and ground

• feet and air

• air and ground

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

• similar
• opposite
• parallel
• west