Friction

Front

The amount of friction depends on the normal force of the objects pressing together.

Back

True

Front

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

Back

static

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

Back

All are examples that are helpful

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

Rougher surfaces have ...

Back

greater friction

Front

F_N=100N, F_f=20N

Back

μ=0.2

Front

What direction does friction act relative to motion?

Back

in the opposite direction

Front

What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?

Back

0.51

Front

A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box? Options: 81 N, 18 N, 98 N, 74 N

Back

74 N

Front

When looking at friction problems, if the net force in the x-direction on an object is zero, what can we say about its acceleration?

Back

it is zero