Have an account?
Skip to Content
Build your own quiz
Suggestions for you
20 questions
Show Answers
See Preview
- 1. Multiple Choice
Friction is an example of _____________
contact force
non contact force
both of these
none of these
- 2. Multiple Choice
The direction of force of friction is always _____ to the direction of motion
same
opposite
unchanged
none of these
- 3. Multiple Choice
Without friction, an object in motion would never stop.
true
false
- 4. Multiple Choice
The rouugher the surface, the faster an object will travel over the surface
true
false
- 5. Multiple Choice
How would the absence of friction affect a marble travelling on a long, straight path?
the marble's speed would decrease
the marble would remain at a constant speed
the marble's speed would increase
the marble would stop immediately
- 6. Multiple Choice
Rough surfaces have _________
greater friction
less friction
the same level of friction
- 7. Multiple Choice
When we rub our hands together _________.
frictional force works between them
energy is released
our hands become warm
all off the above
- 8. Multiple ChoiceWhat is the unit called that measures force?weightmeterNewtonkilogram
- 9. Multiple ChoiceWhat is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12?65 N226 N175 N114 N
- 10. Multiple ChoiceWhat is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?0.780.510.78 N0.58 N
- 11. Multiple ChoiceA box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box?81 N18 N98 N74 N
- 12. Multiple ChoiceWhat are the units on the coefficient of friction?noneNewtonsmeterskilograms
- 13. Multiple Choice
What type of friction is not moving?staticslidingfluidrolling - 14. Multiple Choice
The amount of friction depends on the normal force of the objects pressing together.
True
False
- 15. Multiple ChoiceWhich of the following is an example of friction that is helpful?Brakes used on a bikeTires from a car on the roadTread on the bottom of your shoesAll are examples that are helpful
- 16. Multiple Choice
FN=100N, Ff=20N
μ=5.0
μ=0.2
μ=1.2
μ=0.1
- 17. Multiple Choice
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?
it is positive
it is negative
it is zero
not enough information is given
- 18. Multiple Choice
Normal force is
Always opposite the weight
Always parallel and down the incline
Always perpendicular to the surface
It depends on the direction of motion
- 19. Multiple Choice
This bag is being pulled up without being moved. Which equation describes the forces?
Fg = Fhand - FN
FN = Fg + Fhand
Fhand = FN - Fg
Fg= FN + Fhand
- 20. Multiple Choice
You put your suitcase on the scale. The scale read 22.6 kg. You push down a little on the bag and the scale reads 25.2 kg. The magnitude of the normal force is .....
25.2 kg
252 N
226 N
24.7 N
- Answer choicesTagsAnswer choicesTags