Name: 
 

Chapter 1-4 Review



Multiple Choice
Identify the letter of the choice that best completes the statement or answers the question.
 

1. 

Which of the following is an area of physics that studies motion and its causes?
a.
thermodynamics
c.
quantum mechanics
b.
mechanics
d.
optics
 

2. 

Which of the following is an area of physics that studies heat and temperature?
a.
thermodynamics
c.
quantum mechanics
b.
mechanics
d.
optics
 

3. 

Listening to your favorite radio station involves which area of physics?
a.
optics
c.
vibrations and wave phenomena
b.
thermodynamics
d.
relativity
 

4. 

A baker makes a loaf of bread. Identify the area of physics that this involves.
a.
optics
c.
mechanics
b.
thermodynamics
d.
relativity
 

5. 

A hiker uses a compass to navigate through the woods. Identify the area of physics that this involves.
a.
thermodynamics
c.
electromagnetism
b.
relativity
d.
quantum mechanics
 

6. 

According to the scientific method, why does a physicist make observations and collect data?
a.
to decide which parts of a problem are important
b.
to ask a question
c.
to make a conclusion
d.
to solve all problems
 

7. 

According to the scientific method, how does a physicist formulate and objectively test hypotheses?
a.
by defending an opinion
c.
by experiments
b.
by interpreting graphs
d.
by stating conclusions
 

8. 

In the steps of the scientific method, what is the next step after formulating and objectively testing hypotheses?
a.
interpreting results
b.
stating conclusions
c.
conducting experiments
d.
making observations and collecting data
 

9. 

According to the scientific method, how should conclusions be stated?
a.
so that no one can refute the conclusion
b.
so that it works with only one set of data
c.
so that it is completely correct, with no mistakes
d.
in a form that can be evaluated by others
 

10. 

Diagrams are NOT designed to
a.
show relationships between concepts.
c.
measure an event or situation.
b.
show setups of experiments.
d.
label parts of a model.
 

11. 

Why do physicists use models?
a.
to explain the complex features of simple phenomena
b.
to describe all aspects of a phenomenon
c.
to explain the basic features of complex phenomena
d.
to describe all of reality
 

12. 

Which statement about models is NOT correct?
a.
Models describe only part of reality.
b.
Models help build hypotheses.
c.
Models help guide experimental design.
d.
Models manipulate a single variable or factor in an experiment.
 

13. 

What two dimensions, in addition to mass, are commonly used by physicists to derive additional measurements?
a.
length and width
c.
length and time
b.
area and mass
d.
velocity and time
 

14. 

The symbol mm represents a
a.
micrometer.
c.
megameter.
b.
millimeter.
d.
manometer.
 

15. 

The symbols for units of length in order from smallest to largest are
a.
m, cm, mm, and km.
c.
km, mm, cm, and m.
b.
mm, m, cm, and km.
d.
mm, cm, m, and km.
 

16. 

The SI base unit used to measure mass is the
a.
meter.
c.
kilogram.
b.
second.
d.
liter.
 

17. 

The SI base unit for time is
a.
1 day.
c.
1 minute.
b.
1 hour.
d.
1 second.
 

18. 

The most appropriate SI unit for measuring the length of an automobile is the
a.
centimeter.
c.
meter.
b.
kilometer.
d.
millimeter.
 

19. 

If some measurements agree closely with each other but differ widely from the actual value, these measurements are
a.
neither precise nor accurate.
b.
accurate but not precise.
c.
acceptable as a new standard of accuracy.
d.
precise but not accurate.
 

20. 

Poor precision in scientific measurements may arise from
a.
significant figures.
b.
human error.
c.
scientific notation.
d.
both significant figures and scientific notation.
 

21. 

These values were obtained as the mass of a bar of metal: 8.83 g; 8.84 g; 8.82 g. The known mass is 10.68 g. The values are
a.
accurate.
c.
both accurate and precise.
b.
precise.
d.
neither accurate nor precise.
 

22. 

Five darts strike near the center of a target. The dart thrower is
a.
accurate.
c.
both accurate and precise.
b.
precise.
d.
neither accurate nor precise.
 

23. 

In a game of horseshoes, one horseshoe lands on the post. Four horseshoes land nowhere near the post. The one horseshoe on the post was thrown
a.
accurately.
c.
both accurately and precisely.
b.
precisely.
d.
neither accurately nor precisely.
 

24. 

Calculate the following, and express the answer in scientific notation with the correct number of significant figures: 21.4 + 15 + 17.17 + 4.003
a.
57.573
c.
57.6
b.
57.57
d.
58
 

25. 

Calculate the following, and express the answer in scientific notation with the correct number of significant figures: 10.5 ´ 8.8 ´ 3.14
a.
2.9 ´ 102
c.
290.1
b.
290.136
d.
290
 

26. 

Calculate the following, and express the answer in scientific notation with the correct number of significant figures: (0.82 + 0.042 ) ´ (4.4 ´ 103)
a.
3.8 ´ 103
c.
3.784 ´ 103
b.
3.78 ´ 103
d.
3784
 
 
Hour
Temperature (°C)
1:00
30.0
2:00
29.0
3:00
28.0
4:00
27.5
5:00
27.0
6:00
25.0
 

27. 

A weather balloon records the temperature every hour. From the table above, the temperature
a.
increases.
c.
remains constant.
b.
decreases.
d.
decreases and then increases.
 
 
ch1-4review_files/i0300000.jpg
 

28. 

The time required to make a trip of 100.0 km is measured at various speeds. From the graph above, what speed will allow the trip to be made in 2 hours?
a.
20.0 km/h
c.
50.0 km/h
b.
40.0 km/h
d.
90.0 km/h
 
 
ch1-4review_files/i0320000.jpg
 

29. 

Which of the following equations best describes the graph above?
a.
y = 2x
c.
y = x2
b.
y = x
d.
y = ch1-4review_files/i0330000.jpgx
 
 
ch1-4review_files/i0340000.jpg
 

30. 

Which of the following equations best describes the graph above?
a.
y = x2 + 1
c.
y = –x2 + 1
b.
y = x2 – 1
d.
y = –x2 – 1
 

31. 

The Greek letter delta, D, indicates a(n)
a.
difference or change.
c.
direct proportion.
b.
sum or total.
d.
inverse proportion.
 

32. 

The Greek letter sigma, S, indicates a(n)
a.
difference or change.
c.
direct proportion.
b.
sum or total.
d.
inverse proportion
 

33. 

What are the basic SI units?
a.
meters, kilograms, hours
c.
meters, kilograms, seconds
b.
feet, pounds, seconds
d.
feet, kilograms, seconds
 

34. 

Estimate the order of magnitude of the length of a football field.
a.
10–1 m
c.
104 m
b.
102 m
d.
106 m
 

35. 

Estimate the order of magnitude of your age, measured in units of months.
a.
10–1 months
c.
102 months
b.
101 month
d.
103 months
 

36. 

The sun is composed mostly of hydrogen. The mass of the sun is 2.0 ´ 1030 kg, and the mass of a hydrogen atom is 1.67 ´ 10–27 kg. Estimate the number of atoms in the sun.
a.
103
c.
1030
b.
1057
d.
1075
 

37. 

What is the speed of an object at rest?
a.
0.0 m/s
c.
9.8 m/s
b.
1.0 m/s
d.
9.81 m/s
 

38. 

In addition to displacement, which of the following must be used for a more complete description of the average velocity of an object?
a.
m
c.
Dt
b.
kg
d.
Dx
 

39. 

A dolphin swims 1.85 km/h. How far has the dolphin traveled after 0.60 h?
a.
1.1 km
c.
0.63 km
b.
2.5 km
d.
3.7 km
 

40. 

A hiker travels south along a straight path for 1.5 h with an average velocity of 0.75 km/h, then travels south for 2.5 h with an average velocity of 0.90 km/h. What is the hiker’s displacement for the total trip?
a.
1.1 km to the south
c.
3.4 km to the south
b.
2.2 km to the south
d.
6.7 km to the south
 

41. 

Acceleration is
a.
displacement.
c.
velocity.
b.
the rate of change of displacement.
d.
the rate of change of velocity.
 

42. 

When velocity is positive and acceleration is negative, what happens to the object’s motion?
a.
The object slows down.
c.
Nothing happens to the object.
b.
The object speeds up.
d.
The object remains at rest.
 

43. 

ch1-4review_files/i0480000.jpg
What does the graph above illustrate about acceleration?
a.
The acceleration is constant.
b.
The acceleration is zero.
c.
The acceleration decreases.
d.
There is not enough information to answer.
 

44. 

ch1-4review_files/i0490000.jpg
What does the graph above illustrate about acceleration?
a.
The acceleration varies.
b.
The acceleration is zero.
c.
The acceleration is constant.
d.
The acceleration increases then becomes constant.
 

45. 

A toy car is given an initial velocity of 5.0 m/s and experiences a constant acceleration of 2.0 m/s2. What is the final velocity after 6.0 s?
a.
10.0 m/s
c.
16 m/s
b.
12 m/s
d.
17 m/s
 

46. 

A shopping cart given an initial velocity of 2.0 m/s undergoes a constant acceleration of 3.0 m/s2. What is the magnitude of the cart's displacement after the first 4.0 s of its motion?
a.
10.0 m
c.
32 m
b.
55 m
d.
80.0 m
 

47. 

A race car accelerates from 0 m/s to 30.0 m/s with a displacement of 45.0 m. What is the vehicle's acceleration?
a.
2.00 m/s2
c.
10.0 m/s2
b.
5.00 m/s2
d.
15.0 m/s2
 

48. 

A marble accelerates from rest at a constant rate and travels for a total displacement of 44 m in 20.0 s. What is the average velocity of the marble?
a.
1.1 m/s
c.
4.4 m/s
b.
2.2 m/s
d.
0.0 m/s
 

49. 

A soccer ball is kicked horizontally. What is its average speed if its displacement is 21.0 m after 4.00 s?
a.
5.25 m/s
c.
14.4 m/s
b.
8.75 m/s
d.
2.63 m/s
 

50. 

A curious kitten pushes a ball of yarn at rest with its nose, displacing the ball of yarn 17.5 cm in 2.00 s. What is the acceleration of the ball of yarn?
a.
11.0 cm/s2
c.
14.4 cm/s2
b.
8.75 cm/s2
d.
4.38 cm/s2
 

51. 

A sports car accelerates at a constant rate from rest to a speed of 27.8 m/s in 8.00 s. What is the displacement of the sports car in this time interval?
a.
55.0 m
c.
111 m
b.
77.0 m
d.
222 m
 

52. 

Which of the following units are used to measure free fall?
a.
m/s
c.
m·s
b.
m/s2
d.
m2/s2
 

53. 

Which of the following is a value for the acceleration of objects in free fall?
a.
9.81 m/s2
c.
9.80 m/s2
b.
–9.81 m/s2
d.
–9.80 m/s2
 

54. 

Acceleration due to gravity is also called
a.
negative velocity.
c.
free-fall acceleration.
b.
displacement.
d.
instantaneous velocity.
 

55. 

The baseball catcher throws a ball vertically upward and catches it in the same spot as it returns to the mitt. At what point in the ball’s path does it experience zero velocity and nonzero acceleration at the same time?
a.
midway on the way up
b.
at the top of its trajectory
c.
the instant it leaves the catcher’s hand
d.
the instant before it arrives in the catcher’s mitt
 

56. 

A rock is thrown straight upward with an initial velocity of 24.5 m/s where the downward acceleration due to gravity is 9.81 m/s2. What is the rock's displacement after 1.00 s?
a.
9.81 m
c.
24.5 m
b.
19.6 m
d.
29.4 m
 

57. 

A rock is thrown straight upward with an initial velocity of 19.6 m/s where the downward acceleration due to gravity is 9.81 m/s2. What time interval elapses between the rock's being thrown and its return to the original launch point?
a.
4.00 s
c.
8.00 s
b.
5.00 s
d.
10.0 s
 

58. 

A baseball is released at rest from the top of the Washington Monument. It hits the ground after falling for 6.00 s. What was the height from which the ball was dropped? (Disregard air resistance. g = 9.81 m/s2.)
a.
150.0 m
c.
115 m
b.
177 m
d.
210.0 m
 

59. 

A coin released at rest from the top of a tower hits the ground after falling 1.5 s. What is the speed of the coin as it hits the ground? (Disregard air resistance. g = 9.81 m/s2.)
a.
15 m/s
c.
31 m/s
b.
21 m/s
d.
39 m/s
 

60. 

A rock is thrown from the top of a cliff with an initial speed of 12 m/s. If the rock hits the ground after 2.0 s, what is the height of the cliff? (Disregard air resistance. g = 9.81 m/s2.)
a.
22 m
c.
44 m
b.
24 m
d.
63 m
 

61. 

A tourist accidentally drops a camera from a 40.0 m high bridge. If g = 9.81 m/s2 and air resistance is disregarded, what is the speed of the camera as it hits the water?
a.
28.0 m/s
c.
56.0 m/s
b.
31.0 m/s
d.
784 m/s
 

62. 

Human reaction time is usually about 0.20 s. If your lab partner holds a ruler between your finger and thumb and releases it without warning, how far can you expect the ruler to fall before you catch it? (Disregard air resistance. g = 9.81 m/s2.)
a.
at least 4.0 cm
c.
at least 16.0 cm
b.
at least 9.8 cm
d.
at least 19.6 cm
 

63. 

When there is no air resistance, objects of different masses
a.
fall with equal accelerations with similar displacements.
b.
fall with different accelerations with different displacements.
c.
fall with equal accelerations with different displacements.
d.
fall with different accelerations with similar displacements.
 

64. 

Objects that are falling toward Earth move
a.
faster and faster.
c.
at a constant velocity.
b.
slower and slower.
d.
slower then faster.
 

65. 

Which would hit the ground first if dropped from the same height in a vacuum, a feather or a metal bolt?
a.
the feather
b.
the metal bolt
c.
They would hit the ground at the same time.
d.
They would be suspended in a vacuum.
 

66. 

Which would fall with greater acceleration in a vacuum, a leaf or a stone?
a.
the leaf
b.
the stone
c.
They would accelerate at the same rate.
d.
It is difficult to determine without more information.
 

67. 

Which of the following is a physical quantity that has a magnitude but no direction?
a.
vector
c.
resultant
b.
scalar
d.
frame of reference
 

68. 

Which of the following is a physical quantity that has both magnitude and direction?
a.
vector
c.
resultant
b.
scalar
d.
frame of reference
 

69. 

Identify the following quantities as scalar or vector: the mass of an object, the number of leaves on a tree, wind velocity.
a.
vector, scalar, scalar
c.
scalar, vector, scalar
b.
scalar, scalar, vector
d.
vector, scalar, vector
 

70. 

Identify the following quantities as scalar or vector: the speed of a snail, the time it takes to run a mile, the free-fall acceleration.
a.
vector, scalar, scalar
c.
vector, scalar, vector
b.
scalar, scalar, vector
d.
scalar, vector, vector
 

71. 

Which of the following is an example of a vector quantity?
a.
velocity
c.
volume
b.
temperature
d.
mass
 

72. 

For the winter, a duck flies 10.0 m/s due south against a gust of wind with a velocity of 2.5 m/s. What is the resultant velocity of the duck?
a.
12.5 m/s south
c.
7.5 m/s south
b.
–12.5 m/s south
d.
–7.5 m/s south
 

73. 

A lightning bug flies at a velocity of 0.25 m/s due east toward another lightning bug seen off in the distance. A light easterly breeze blows on the bug at a velocity of 0.25 m/s. What is the resultant velocity of the lightning bug?
a.
0.50 m/s
c.
0.75 m/s
b.
0.00 m/s
d.
0.25 m/s
 

74. 

A jogger runs 10.0 blocks due east, 5.0 blocks due south, and another 2.0 blocks due east. Assume all blocks are of equal size. Use the graphical method to find the magnitude of the jogger’s net displacement.
a.
14.0 blocks
c.
11.0 blocks
b.
8.0 blocks
d.
13.0 blocks
 

75. 

A cave explorer travels 3.0 m eastward, then 2.5 m northward, and finally 15 m westward. Use the graphical method to find the magnitude of the net displacement.
a.
12 m
c.
18 m
b.
5.7 m
d.
15 m
 

76. 

A student adds two vectors with magnitudes of 200 and 40. Taking into account significant figures, which is the only possible choice for the magnitude of the resultant?
a.
160
c.
300
b.
200
d.
240
 

77. 

Multiplying or dividing vectors by scalars results in
a.
vectors.
b.
scalars.
c.
vectors if multiplied or scalars if divided.
d.
scalars if multiplied or vectors if divided.
 

78. 

An ant on a picnic table travels 3.0 ´ 101 cm eastward, then 25 cm northward, and finally 15 cm westward. What is the ant’s directional displacement relative to its original position?
a.
29 cm at 59° north of east
c.
57 cm at 29° north of west
b.
52 cm at 29° north of east
d.
29 cm at 77° north of east
 

79. 

A duck waddles 2.5 m east and 6.0 m north. What are the magnitude and direction of the duck’s displacement with respect to its original position?
a.
3.5 m at 19° north of east
c.
6.5 m at 67° north of east
b.
6.3 m at 67° north of east
d.
6.5 m at 72° north of east
 

80. 

A quarterback takes the ball from the line of scrimmage and runs backward for 1.0 ´ 101 m then sideways parallel to the line of scrimmage for 15 m. The ball is thrown forward 5.0 ´ 101 m perpendicular to the line of scrimmage. The receiver is tackled immediately. How far is the football displaced from its original position?
a.
43 m
c.
62 m
b.
55 m
d.
75 m
 

81. 

A plane flies from city A to city B. City B is 1540 km west and 1160 km south of city A. What is the total displacement and direction of the plane?
a.
1930 km, 43.0° south of west
c.
1850 km, 37.0° south of west
b.
1850 km, 43.0° south of west
d.
1930 km, 37.0° south of west
 

82. 

While following directions on a treasure map, a person walks 45.0 m south, then turns and walks 7.50 m east. Which single straight-line displacement could the treasure hunter have walked to reach the same spot?
a.
45.6 m at 9.5° south of east
c.
45.6 m at 9.5° east of south
b.
52.5 m at 21° east of south
d.
45.6 m at 21° south of east
 

83. 

In a coordinate system, the x-component of a given vector is equal to that vector’s magnitude multiplied by which trigonometric function, with respect to the angle between the vector and the x-axis?
a.
the cosine of q
c.
the tangent of q
b.
the sine of q
d.
the cotangent of q
 

84. 

In a coordinate system, if the x component of a vector and the angle between the vector and x-axis are known, then the magnitude of the vector is calculated by which operation, taken with respect to the x component?
a.
dividing by the sine of q
c.
multiplying by the sine of q
b.
dividing by the cosine of q
d.
multiplying by the cosine of q
 

85. 

A string attached to an airborne kite was maintained at an angle of 40.0° with the ground. If 120 m of string was reeled in to return the kite back to the ground, what was the horizontal displacement of the kite? (Assume the kite string did not sag.)
a.
110 m
c.
77 m
b.
84 m
d.
92 m
 

86. 

An athlete runs 110 m across a level field at an angle of 30.0° north of east. What are the east and north components, respectively, of this displacement?
a.
64 m; 190 m
c.
95 m; 55 m
b.
190 m; 64 m
d.
55 m; 95 m
 

87. 

A skateboarder rolls 25.0 m down a hill that descends at an angle of 20.0° with the horizontal. Find the horizontal and vertical components of the skateboarder's displacement.
a.
8.55 m; 23.5 m
c.
23.5 m; 73.1 m
b.
23.5 m; 8.55 m
d.
73.1 m; 26.6 m
 

88. 

Find the resultant of these two vectors: 2.00 ´ 102 units due east and 4.00 ´ 102 units 30.0° north of west.
a.
300 units 29.8° north of west
c.
546 units 59.3° north of west
b.
581 units 20.1° north of east
d.
248 units 53.9° north of west
 

89. 

Vector A is 3.2 units in length and points along the positive y-axis. Vector B is 4.6 units in length and points along a direction 195° counterclockwise from the positive x-axis. What is the magnitude of the resultant when vectors A and B are added?
a.
1.2 units
c.
4.8 units
b.
6.2 units
d.
5.6 units
 

90. 

What is the resultant displacement of a dog looking for its bone in the yard, if the dog first heads 55° north of west for 10.0 m, and then turns and heads west for 5.00 m?
a.
11.2 m at 63° west of north
c.
13.5 m at 37° north of east
b.
13.5 m at 37° north of west
d.
62.1 m at 74° north of west
 

91. 

A hiker walks 4.5 km at an angle of 45° north of west. Then the hiker walks 4.5 km south. What is the magnitude and direction of the hiker’s total displacement?
a.
3.5 km, 22° south of west
c.
6.4 km, 45° north of west
b.
3.5 km, 22° north of west
d.
6.4 km, 22° south of west
 

92. 

Which of the following is the motion of objects moving in two dimensions under the influence of gravity?
a.
horizontal velocity
c.
parabola
b.
directrix
d.
projectile motion
 

93. 

Which of the following is an example of projectile motion?
a.
a jet lifting off a runway
b.
a bullet being fired from a gun
c.
dropping an aluminum can into the recycling bin
d.
a space shuttle orbiting Earth
 

94. 

Which of the following is NOT an example of projectile motion?
a.
a volleyball served over a net
c.
a hot-air balloon drifting toward Earth
b.
a baseball hit by a bat
d.
a long jumper in action
 

95. 

What is the path of a projectile?
a.
a wavy line
b.
a parabola
c.
a hyperbola
d.
Projectiles do not follow a predictable path.
 

96. 

Which of the following exhibits parabolic motion?
a.
a person diving into a pool from a diving board
b.
a space shuttle orbiting Earth
c.
a leaf falling from a tree
d.
a train moving along a flat track
 

97. 

Which of the following does NOT exhibit parabolic motion?
a.
a frog jumping from land into water
b.
a basketball thrown to a hoop
c.
a flat piece of paper released from a window
d.
a baseball thrown to home plate
 

98. 

A stone is thrown at an angle of 30.0° above the horizontal from the top edge of a cliff with an initial speed of 12 m/s. A stopwatch measures the stone’s trajectory time from the top of the cliff to the bottom at 5.6 s. What is the height of the cliff? (Disregard air resistance. g = 9.81 m/s2.)
a.
58 m
c.
120 m
b.
150 m
d.
180 m
 

99. 

A track star in the long jump goes into the jump at 12 m/s and launches herself at 20.0° above the horizontal. How long is she in the air before returning to Earth? (g = 9.81 m/s2)
a.
0.42 s
c.
1.5 s
b.
0.83 s
d.
1.2 s
 

100. 

A model rocket flies horizontally off the edge of the cliff at a velocity of 50.0 m/s. If the canyon below is 100.0 m deep, how far from the edge of the cliff does the model rocket land?
a.
112 m
c.
337 m
b.
225 m
d.
400 m
 

101. 

A firefighter 50.0 m away from a burning building directs a stream of water from a fire hose at an angle of 30.0° above the horizontal. If the velocity of the stream is 40.0 m/s, at what height will the stream of water strike the building?
a.
9.60 m
c.
18.7 m
b.
13.4 m
d.
22.4 m
 

102. 

Which of the following is a coordinate system for specifying the precise location of objects in space?
a.
x-axis
c.
frame of reference
b.
y-axis
d.
diagram
 

103. 

A passenger on a bus moving east sees a man standing on a curb. From the passenger’s perspective, the man appears to
a.
stand still.
b.
move west at a speed that is less than the bus’s speed.
c.
move west at a speed that is equal to the bus’s speed.
d.
move east at a speed that is equal to the bus’s speed.
 

104. 

A piece of chalk is dropped by a teacher walking at a speed of 1.5 m/s. From the teacher’s perspective, the chalk appears to fall
a.
straight down.
c.
straight down and forward.
b.
straight down and backward.
d.
straight backward.
 

105. 

A jet moving at 500.0 km/h due east moves into a region where the wind is blowing at 120.0 km/h in a direction 30.0° north of east. What is the new velocity and direction of the aircraft relative to the ground?
a.
607 km/h, 5.67° north of east
c.
550.0 km/h, 6.22° north of east
b.
620.0 km/h, 7.10° north of east
d.
588 km/h, 4.87° north of east
 

106. 

A boat moves at 10.0 m/s relative to the water. If the boat is in a river where the current is 2.00 m/s, how long does it take the boat to make a complete round trip of 1000.0 m upstream followed by 1000.0 m downstream?
a.
199 s
c.
208 s
b.
203 s
d.
251 s
 

107. 

A superhero flying at treetop level sees the Eiffel Tower elevator begin to free fall. If the superhero is 1.00 km away from the tower and the elevator falls from a height of 240.0 m, how long does the superhero have to save the people in the elevator? What should the superhero’s average velocity be?
a.
7 s; 333 m/s
c.
7 s; 143 m/s
b.
5 s; 200 m/s
d.
9 s; 111 m/s
 

108. 

A small airplane flies at a velocity of 145 km/h toward the south as observed by a person on the ground. The airplane pilot measures an air velocity of 170.0 km/h south. What is the velocity of the wind that affects the plane?
a.
25 km/h south
c.
315 km/h south
b.
25 km/h north
d.
315 km/h north
 

109. 

Which of the following is the cause of an acceleration or a change in an object’s motion?
a.
speed
c.
force
b.
inertia
d.
velocity
 

110. 

Which of the following statements does NOT describe force?
a.
Force causes objects at rest to remain stationary.
b.
Force causes objects to start moving.
c.
Force causes objects to stop moving.
d.
Force causes objects to change direction.
 

111. 

What causes a moving object to change direction?
a.
acceleration
c.
inertia
b.
velocity
d.
force
 

112. 

Which of the following forces arises from direct physical contact between two objects?
a.
gravitational force
c.
contact force
b.
fundamental force
d.
field force
 

113. 

Which of the following forces exists between objects even in the absence of direct physical contact?
a.
frictional force
c.
contact force
b.
fundamental force
d.
field force
 

114. 

Which of the following forces is an example of a contact force?
a.
gravitational force
c.
electric force
b.
magnetic force
d.
frictional force
 

115. 

Which of the following forces is an example of a field force?
a.
gravitational force
c.
normal force
b.
frictional force
d.
tension
 
 
ch1-4review_files/i1210000.jpg
 

116. 

In the free-body diagram shown above, which of the following is the gravitational force acting on the car?
a.
5800 N
c.
14 700 N
b.
775 N
d.
13 690 N
 

117. 

In the free-body diagram show above, the 5800 N force represents
a.
the gravitational force acting on the car.
b.
the backward force the road exerts on the car.
c.
the upward force the road exerts on the car.
d.
the force exerted by a towing cable on the car.
 

118. 

A free-body diagram of a ball in free fall in the presence of air resistance would show
a.
a downward arrow to represent the force of air resistance.
b.
only a downward arrow to represent the force of gravity.
c.
a downward arrow to represent the force of gravity and an upward arrow to represent the force of air resistance.
d.
an upward arrow to represent the force of gravity and a downward arrow to represent the force of air resistance.
 
 
ch1-4review_files/i1250000.jpg
 

119. 

In the free-body diagram shown above, which of the following is the gravitational force acting on the balloon?
a.
1520 N
c.
4050 N
b.
950 N
d.
5120 N
 

120. 

Which of the following is the tendency of an object to maintain its state of motion?
a.
acceleration
c.
force
b.
inertia
d.
velocity
 

121. 

A late traveler rushes to catch a plane, pulling a suitcase with a force directed 30.0° above the horizontal. If the horizontal component of the force on the suitcase is 60.6 N, what is the force exerted on the handle?
a.
53.0 N
c.
65.2 N
b.
70.0 N
d.
95.6 N
 

122. 

A car goes forward along a level road at constant velocity. The additional force needed to bring the car into equilibrium is
a.
greater than the normal force times the coefficient of static friction.
b.
equal to the normal force times the coefficient of static friction.
c.
the normal force times the coefficient of kinetic friction.
d.
zero.
 

123. 

A sled is pulled at a constant velocity across a horizontal snow surface. If a force of 8.0 ´ 101 N is being applied to the sled rope at an angle of 53° to the ground, what is the force of friction between the sled and the snow?
a.
83 N
c.
48 N
b.
64 N
d.
42 N
 

124. 

A trapeze artist weighs 8.00 ´ 102 N. The artist is momentarily held to one side of a swing by a partner so that both of the swing ropes are at an angle of 30.0° with the vertical. In such a condition of static equilibrium, what is the horizontal force being applied by the partner?
a.
924 N
c.
196 N
b.
433 N
d.
462 N
 

125. 

If a nonzero net force is acting on an object, then the object is definitely
a.
at rest.
c.
being accelerated.
b.
moving with a constant velocity.
d.
losing mass.
 

126. 

A wagon with a weight of 300.0 N is accelerated across a level surface at 0.5 m/s2. What net force acts on the wagon? (g = 9.81 m/s2)
a.
9.0 N
c.
150 N
b.
15 N
d.
610 N
 

127. 

Which statement about the acceleration of an object is correct?
a.
The acceleration of an object is directly proportional to the net external force acting on the object and inversely proportional to the mass of the object.
b.
The acceleration of an object is directly proportional to the net external force acting on the object and directly proportional to the mass of the object.
c.
The acceleration of an object is inversely proportional to the net external force acting on the object and inversely proportional to the mass of the object.
d.
The acceleration of an object is inversely proportional to the net external force acting on the object and directly proportional to the mass of the object.
 

128. 

A small force acting on a human-sized object causes
a.
a small acceleration.
c.
a large acceleration.
b.
no acceleration.
d.
equilibrium.
 

129. 

According to Newton’s second law, when the same force is applied to two objects of different masses,
a.
the object with greater mass will experience a great acceleration and the object with less mass will experience an even greater acceleration.
b.
the object with greater mass will experience a smaller acceleration and the object with less mass will experience a greater acceleration.
c.
the object with greater mass will experience a greater acceleration and the object with less mass will experience a smaller acceleration.
d.
the object with greater mass will experience a small acceleration and the object with less mass will experience an even smaller acceleration.
 

130. 

Two perpendicular forces, one of 45.0 N directed upward and the second of 60.0 N directed to the right, act simultaneously on an object with a mass of 35.0 kg. What is the magnitude of the resultant acceleration of the object?
a.
2.14 m/s2
b.
3.00 m/s2
c.
5.25 m/s2
d.
1.41 m/s2
 

131. 

A sailboat with a mass of 2.0 ´ 103 kg experiences a tidal force of 3.0 ´ 103 N directed to the east and a wind force against its sails with a magnitude of 6.0 ´ 103 N directed toward the northwest (45° N of W). What is the magnitude of the resultant acceleration of the boat?
a.
2.2 m/s2
c.
1.5 m/s2
b.
2.1 m/s2
d.
4.4 m/s2
 

132. 

An airplane with a mass of 1.2 ´ 104 kg tows a glider with a mass of 0.60 ´ 104 kg. If the airplane propellers provide a net forward thrust of 3.6 ´ 104 N, what is the acceleration of the glider?
a.
2.0 m/s2
c.
6.0 m/s2
b.
3.0 m/s2
d.
9.8 m/s2
 

133. 

An elevator weighing 2.00 ´ 105 N is supported by a steel cable. What is the tension in the cable when the elevator is accelerated upward at a rate of 3.00 m/s2? (g = 9.81 m/s2)
a.
1.39 ´ 105 N
c.
2.42 ´ 105 N
b.
2.31 ´ 105 N
d.
2.61 ´ 105 N
 

134. 

A hammer drives a nail into a piece of wood. Identify an action-reaction pair, and compare the forces exerted by each object.
a.
The nail exerts a force on the hammer; the hammer exerts a force on the wood.
b.
The hammer exerts a force on the nail; the wood exerts a force on the nail.
c.
The hammer exerts a force on the nail; the nail exerts a force on the hammer.
d.
The hammer exerts a force on the nail; the hammer exerts a force on the wood.
 

135. 

A hockey stick hits a puck on the ice. Identify an action-reaction pair, and compare the forces exerted by each object.
a.
The stick exerts a force on the puck; the puck exerts a force on the stick.
b.
The stick exerts a force on the puck; the puck exerts a force on the ice.
c.
The puck exerts a force on the stick; the stick exerts a force on the ice.
d.
The stick exerts a force on the ice; the ice exerts a force on the puck.
 

136. 

A leaf falls from a tree and lands on the sidewalk. Identify an action-reaction pair, and compare the forces exerted by each object.
a.
The tree exerts a force on the leaf; the sidewalk exerts a force on the leaf.
b.
The leaf exerts a force on the sidewalk; the sidewalk exerts a force on the leaf.
c.
The leaf exerts a force on the tree; the sidewalk exerts a force on the leaf.
d.
The leaf exerts a force on the sidewalk; the tree exerts a force on the leaf.
 

137. 

A ball is dropped from a person’s hand and falls to Earth. Identify an action-reaction pair, and compare the forces exerted by each object.
a.
The hand exerts a force on the ball; Earth exerts a force on the hand.
b.
Earth exerts a force on the ball; the hand exerts a force on Earth.
c.
Earth exerts a force on the hand; the hand exerts a force on the ball.
d.
Earth exerts a gravitational force on the ball; the ball exerts a gravitational force on Earth.
 

138. 

Which are simultaneous equal but opposite forces resulting from the interaction of two objects?
a.
net external forces
c.
gravitational forces
b.
field forces
d.
action-reaction pairs
 

139. 

As a basketball player starts to jump for a rebound, the player begins to move upward faster and faster until his shoes leave the floor. At the moment the player begins to jump, the force of the floor on the shoes is
a.
greater than the player’s weight.
b.
equal in magnitude and opposite in direction to the player's weight.
c.
less than the player’s weight.
d.
zero.
 

140. 

The magnitude of the force of gravity acting on an object is
a.
frictional force.
c.
inertia.
b.
weight.
d.
mass.
 

141. 

A measure of the quantity of matter is
a.
density.
c.
force.
b.
weight.
d.
mass.
 

142. 

A change in the force of gravity acting on an object will affect the object’s
a.
mass.
c.
weight.
b.
frictional force.
d.
inertia.
 

143. 

A weight of 5.00 ´ 103 N is suspended in equilibrium by two cables. Cable 1 applies a horizontal force to the right of the object and has a tension, FT1. Cable 2 applies a force upward and to the left at an angle of 37.0° to the negative x-axis and has a tension, FT2. What is FT2?
a.
4440 N
c.
8310 N
b.
6640 N
d.
3340 N
 

144. 

A sled weighing 1.0 ´ 102 N is held in place on a frictionless 20.0° slope by a rope attached to a stake at the top. The rope is parallel to the slope. What is the normal force of the slope acting on the sled?
a.
94 N
c.
37 N
b.
47 N
d.
34 N
 

145. 

A mule uses a rope to pull a box that weighs 3.0 ´ 102 N across a level surface with constant velocity. The rope makes an angle of 30.0° above the horizontal, and the tension in the rope is 1.0 ´ 102 N. What is the normal force of the floor on the box?
a.
300.0 N
c.
50.0 N
b.
86 N
d.
250 N
 

146. 

A book with a mass of 2.0 kg is held in equilibrium on a board with a slope of 60.0° by a horizontal force. What is the normal force exerted by the book?
a.
39 N
c.
15 N
b.
61 N
d.
34 N
 

147. 

A couch with a mass of 1 ´ 102 kg is placed on an adjustable ramp connected to a truck. As one end of the ramp is raised, the couch begins to move downward. If the couch slides down the ramp with an acceleration of 0.70 m/s2 when the ramp angle is 25°, what is the coefficient of kinetic friction between the ramp and couch?
(g = 9.81 m/s2)
a.
0.47
c.
0.39
b.
0.42
d.
0.12
 

148. 

There are six books in a stack, and each book weighs 5 N. The coefficient of friction between the books is 0.2. With what horizontal force must one push to start sliding the top five books off the bottom one?
a.
1 N
c.
3 N
b.
5 N
d.
7 N
 

149. 

A crate is carried in a pickup truck traveling horizontally at 15.0 m/s. The truck applies the brakes for a distance of 28.7 m while stopping with uniform acceleration. What is the coefficient of static friction between the crate and the truck bed if the crate does not slide?
a.
0.400
c.
0.892
b.
0.365
d.
0.656
 

150. 

An ice skater moving at 10.0 m/s coasts to a halt in 1.0 ´ 102 m on a smooth ice surface. What is the coefficient of friction between the ice and the skates?
a.
0.025
c.
0.102
b.
0.051
d.
0.205
 

151. 

An Olympic skier moving at 20.0 m/s down a 30.0° slope encounters a region of wet snow and slides 145 m before coming to a halt. What is the coefficient of friction between the skis and the snow?
a.
0.540
c.
0.116
b.
0.740
d.
0.470
 



 
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