Unit: Friction

How does friction affect speed?

• More friction decreases speed

• Less friction decreases speed

• More friction increases speed

• Less friction doesn't affect speed

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

• Similar

• Parallel

• Opposite

• West

A type of friction that occurs when air pushes against a moving object causing it to slow down.

• Surface area

• Velocity

• Air resistance

• Gravity

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

• Brakes used on a bike

• Tread on the bottom of your shoes

• Tires against the road

• All are examples that are helpful

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

• Pencil marking on paper

• Sand placed on ice in the winter

• Engine parts wearing out

• Using eraser to erase marks

What does friction produce?

• Light

• Heat

• Sound

• Gravity

Without friction, a moving object will never stop.

• True

• False

The rougher the surface, the faster an object will travel over it.

• True

• False

Rough surfaces have ________________

• Greater friction

• The same level of friction

• Less friction

The shape of an object that helps in reducing friction.

• Circular shape

• Flat shape

• Streamlined

• None of the above