Friction

Front

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

Back

opposite

Front

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

Back

True

Front

What type of friction is not moving? Options: static, sliding, fluid, rolling

Back

static

Front

How can friction be reduced?

Back

All of the above are ways of reducing friction: reduce the force acting between the 2 surfaces, reduce the roughness of the 2 surfaces coming in contact, use wax, grease or oil.

Front

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

Back

air resistance

Front

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

Back

All are examples that are helpful

Front

Which of the following is an example of friction that is harmful? Options: Pencil marking on paper, Engine parts wearing out, sand placed on ice in the winter, Using an eraser to erase marks

Back

Engine parts wearing out

Front

How would the absence of friction affect a marble traveling on a long, straight path? Options: The marble’s speed would decrease., The marble’s speed would increase., The marble would stop immediately., The marble would remain at constant speed.

Back

The marble would remain at constant speed.

Front

When two surfaces rub, the irregularities of one surface get caught on those of the other surface?

Back

True

Front

Rougher surfaces have ...

Back

greater friction