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Worksheetsfriction and inclined planes
Total questions: 15
Worksheet time: 2hrs 40mins
Name
Class
Date
1.
What direction does friction act relative to motion?
a)
in the same direction
b)
in the opposite direction
c)
need more information
d)
depends on the force
2.
What is the force of friction between a block of ice that weighs 950 N and the ground if μ = .12?
a)
65 N
b)
226 N
c)
175 N
d)
114 N
3.
What is the coefficient of static friction if it takes 44 N of force to move a box that weighs 86 N?
a)
0.78
b)
0.51
c)
0.78 N
d)
0.58 N
4.
A box takes 40 N to start moving when the coefficient of static friction is .54. What is the weight of the box?
a)
81 N
b)
18 N
c)
98 N
d)
74 N
5.
What are the units on the force due to friction?
a)
none
b)
Newtons
c)
meters
d)
kilograms
6.
FN=100N, Ff=20N
a)
μ=5.0
b)
μ=0.2
c)
μ=1.2
d)
μ=0.1
7.
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?
a)
it is positive
b)
it is negative
c)
it is zero
d)
not enough information is given
8.
Normal force is
a)
Always opposite the weight
b)
Always parallel and down the incline
c)
Always perpendicular to the surface
d)
It depends on the direction of motion
9.
Which of the following is the best expression for the Normal Force?
a)
FN = mg cos(ϴ)
b)
FN = mg sin(ϴ)
c)
FN = mg sin(180-ϴ)
d)
FN = mg cos(90-ϴ)
10.
A box weighing 46 newtons rests on an incline that makes an angle of 25° with the horizontal. What is the magnitude of the component of the box’s weight perpendicular to the incline?
a)
19N
b)
21N
c)
42N
d)
26N
11.
An 8.0-newton block is accelerating down a frictionless ramp inclined at 15° to the horizontal. What is the magnitude of the net force causing the block’s acceleration (parallel to the ramp)?
a)
0N
b)
2.1N
c)
7.7N
d)
8.0N
12.
A 1.0 × 105-newton truck at rest on a hill that makes an angle of 8.0° with the horizontal. What is the component of the truck’s weight parallel to the hill?
a)
1.4E3N
b)
1E4N
c)
1.4E4N
d)
9.9E4N
13.
A cart rolls down an inclined plane with constant speed as shown in the diagram below. Which arrow represents the direction of frictional force?
a)
A
b)
B
c)
C
d)
D
14.
A 10.-newton block is sliding down a 30-degree incline at a constant speed. What is the force of friction?
a)
5N
b)
4.9N
c)
10N
d)
98N
15.
A 10.0-kilogram mass held at rest on a frictionless 30.0º incline by force F. What is the magnitude of force F?
a)
49.1N
b)
98.1N
c)
85N
d)
9.81N
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