ame: ________________________
Exam 2--PHYS 101--F11--Chapters 4, 5, & 6
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
____
1. Consider this figure. What is the normal force acting on the block?
a. 98 N
c. 85 N
b. 49 N
d. 10 N
2. In the figure for the previous problem, what is the coefficient of static friction, between the block and
inclined plane, required to keep the block in place?
a.
b.
c.
0.6
0.1
49
d.
e.
1
0.3
1
____
____
3. Which of these statements best describe Aristotle’s view of the natural world:
a. objects will continue in motion unless an c. the mass of an object is a measure of its
outside force acts on them
inertia
b. all objects are propelled by a mystical
d. all objects have a natural state, which is
force that emanates from the Earth
at rest
4. Which of these make up the basic SI units of the newton?
kg m
kg m
c.
a.
s
s2
b.
____
____
____
kg 2 m2
d.
kg m2
s2
s2
5. A force causes this bucket to accelerate upwards as shown. What is the magnitude of the force?
a. 10 N
c. 200 N
b. 50 N
d. 150 N
6. From rest, we step on the gas of our Subaru, providing a force F for 4 secs, travelling a distance of 10 meters.
If the applied force were only 1 2 F, how far does the car travel in the same amount of time?
a. 10 m
d. 15 m
b. 20 m
e. 5 m
c. 2.5 m
7. A block of mass m rests on the floor of an elevator that is accelerating upward. What is the relationship
between the force due to gravity (F g) and the normal force on the block (F N)?
a.
b.
FN>Fg
FN=Fg
c.
d.
2
FN<Fg
it depends on the mass of the block
____
8. This figure shows a block supported by 2 ropes. What is the tension in the rope on the right?
____
a. 230 N
b. 180 N
9. Which of these is a conservative force?
c.
d.
150 N
300 N
a. II & IV
c.
b. I, III, & IV
d.
____ 10. Which is usually larger, kinetic or static friction?
I & III
I & II
I. Gravitational force
II. Frictional force
III. Electric force
IV. Normal Force
a.
b.
kinetic friction
static friction
c.
d.
3
they are usually the same
it depends on the mass of the objects
____ 11. In this figure, all of the blocks have a displacement to the right. The magnitude of the force is the same for
each block. Which force is doing the least amount of work?
a. a
c. c
b. b
d. d
____ 12. This figure shows two forces acting on a block; the block travels 3.4 meters to the right. What is the net
work done on the block by both forces?
a.
b.
8.6 J
3.7 J
c.
d.
4
12 J
16 J
____ 13. You throw a ball up in the air, and it goes to a height of 16 m. What is the speed of the ball when it is at a
position of 8.0 m?
a. 13 m/s
c. 22 m/s
b. 18 m/s
d. 5.0 m/s
____ 14. You kick a ball, whose mass is 1.3 kg, at an angle of 43º. You give it an initial velocity of
12 m/s. What is the ball’s maximum height? (Hint: Consider the y-component of the ball’s initial velocity.)
a. 3.4 m
c. 7.3 m
b. 5.2 m
d. 3.9 m
____ 15. A car travels a distance x at acceleration a and does work W. If the car travels a distance 2x at the same
acceleration, what is the work it has done?
c. 4W
a. W
b. 2W
d. W
____ 16. Which requires more energy: to take a car from 0⇒30 mi/hr or from 30⇒60 mi/hr?
a.
b.
0⇒30
30⇒60
c.
d.
5
both the same
it depends on the mass of the car
____ 17. Consider this figure. Three blocks of mass m slide down different inclined planes, each beginning at a height
h. The coefficient of kinetic friction for the inclined planes is 0.3. Which block has the most energy at the
bottom of the inclined plane?
a. a
c. c
b. b
d. all have the same energy
____ 18. You compress a mass on a spring, as in this figure, and release it. At what position does the mass have its
largest speed?
a.
b.
x=-a
x=0
c.
d.
6
x=+a
x=a
____ 19. A force of 1.0 N pushes a block over a rough, flat surface at a constant speed of 2.0 m/s. The force pushes
the block a total distance of 8.0 m. What is the power used to produce this motion?
a. 4.0 W
c. 2.0 W
b. 16 W
d. 0.25 W
____ 20. A car is travelling at 22 m/s and crashes into a wall. The collision occurs in 0.10 seconds, and the car
rebounds at 2.0 m/s. The mass of the car is 1000.0 kg. What force is exerted on the car in this collision?
a.
b.
200,000 N
22,000 N
c.
d.
7
240,000 N
220,000 N
____ 21. The following figure shows a perfectly inelastic collision, where the two particles stick together after
colliding. What is the final speed of the particles?
a. -0.46 m/s
c. 0.34 m/s
b. 1.3 m/s
d. 0.71 m/s
____ 22. Which of these statements is most appropriate for an elastic collision?
a.
momentum is conserved
c.
both energy and momentum are
conserved
b. energy is conserved
d. neither energy or momentum are
conserved
____ 23. A uranium nucleus (at rest) undergoes fission and splits into two fragments, one heavy and the other light.
Which fragment has the greater speed?
a. the heavy fragment
c. both have the same speed
b. the light fragment
d. it depends on the energy of the fragments
____ 24. A collection of particles has a total momentum of zero. Which of these statements is true?
a. the kinetic energy of the particles must
c. the particles have no mass
be zero
b. the kinetic energy of the particles might d. the particles are definitely moving
be zero, but not necessarily
____ 25. The answer to this question is “A.”
a. A
c. C
b. B
d. D
8
ID: A
Exam 2--PHYS 101--F11--Chapters 4, 5, & 6
Answer Section
MULTIPLE CHOICE
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