Multiple Choice
Identify the
letter of the choice that best completes the statement or answers the question.
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1.
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Which of the
following forces is an example of a field force? a. | gravitational force | c. | frictional force | b. | normal
force | d. | tension | | | | |
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2.
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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. | 8310
N | c. | 4440
N | b. | 3340
N | d. | 6640
N | | | | |
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3.
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The
statement by Newton that for every action there is an equal but opposite reaction is which of his
laws of motion? a. | third | c. | second | b. | first | d. | fourth | | | | |
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4.
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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. | 86
N | b. | 50.0
N | d. | 250
N | | | | |
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5.
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Which
statement about the acceleration of an object is correct? a. | 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. | b. | 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. | c. | 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. | d. | 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. | | |
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6.
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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 small acceleration and the object with less mass will experience an even
smaller acceleration. | b. | the object with greater mass will experience a greater acceleration
and the object with less mass will experience a smaller acceleration. | c. | the object with greater
mass will experience a great acceleration and the object with less mass will experience an even
greater acceleration. | d. | the object with greater mass will experience a smaller acceleration
and the object with less mass will experience a greater acceleration. | | |
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7.
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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. | equal in magnitude and
opposite in direction to the player's weight. | b. | greater than the
player’s weight. | c. | zero. | d. | less than the player’s weight. | | |
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8.
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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 hammer exerts a
force on the nail; the wood exerts a force on the nail. | b. | The hammer exerts a
force on the nail; the hammer exerts a force on the wood. | c. | The nail exerts a force
on the hammer; the hammer exerts a force on the wood. | d. | The hammer exerts a
force on the nail; the nail exerts a force on the hammer. | | |
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9.
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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 ice; the ice exerts a force on the puck. | 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 puck; the puck exerts a force on the stick. | | |
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10.
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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)
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11.
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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. | 150 N | c. | 610 N | b. | 9.0 N | d. | 15 N | | | | |
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12.
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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. | 2.1
m/s2 | b. | 4.4 m/s2 | d. | 1.5 m/s2 | | | | |
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13.
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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?
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14.
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In the
free-body diagram show above, the 5800 N force represents a. | the upward force the
road exerts on the car. | b. | the force exerted by a towing cable on the
car. | c. | the gravitational force
acting on the car. | d. | the backward force the road exerts on the
car. | | |
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15.
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In the
free-body diagram shown above, which of the following is the gravitational force acting on the
car? a. | 13 690
N | c. | 775
N | b. | 5800
N | d. | 14 700
N | | | | |
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16.
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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?
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17.
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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?
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18.
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A measure of
the quantity of matter is a. | mass. | c. | density. | b. | force. | d. | weight. | | | | |
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19.
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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. | 2.61 ´ 105
N | c. | 2.42 ´ 105
N | b. | 2.31 ´ 105
N | d. | 1.39 ´ 105
N | | | | |
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20.
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A small
force acting on a human-sized object causes a. | a large acceleration. | c. | no acceleration. | b. | a small
acceleration. | d. | equilibrium. | | | | |
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21.
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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. | 0.051 | b. | 0.102 | d. | 0.205 | | | | |
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22.
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Which of the
following statements does NOT describe force? a. | Force causes objects to change direction. | b. | Force causes objects to
start moving. | c. | Force causes objects to stop moving. | d. | Force causes objects at
rest to remain stationary. | | |
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23.
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If a nonzero
net force is acting on an object, then the object is definitely a. | at
rest. | c. | moving with a constant
velocity. | b. | losing mass. | d. | being accelerated. | | | | |
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24.
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What causes
a moving object to change direction? a. | acceleration | c. | force | b. | inertia | d. | velocity | | | | |
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25.
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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. | 462
N | c. | 196
N | b. | 433
N | d. | 924
N | | | | |
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26.
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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. | 0.365 | c. | 0.656 | b. | 0.400 | d. | 0.892 | | | | |
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27.
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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 leaf exerts a force on the sidewalk; the tree exerts a force on
the leaf. | b. | The tree exerts a force on the leaf; 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 sidewalk exerts a force
on the leaf. | | |
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28.
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A change in
the force of gravity acting on an object will affect the object’s a. | mass. | c. | frictional
force. | b. | weight. | d. | inertia. | | | | |
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29.
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Which of the
following forces arises from direct physical contact between two objects? a. | contact
force | c. | gravitational
force | b. | field force | d. | fundamental force | | | | |
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30.
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Which of the
following forces exists between objects even in the absence of direct physical
contact? a. | contact
force | c. | frictional
force | b. | fundamental force | d. | field force | | | | |
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31.
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Which of the
following is the tendency of an object to maintain its state of motion? a. | inertia | c. | force | b. | acceleration | d. | velocity | | | | |
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32.
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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?
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33.
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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. | an upward arrow to represent the force of gravity and a downward arrow
to represent the force of air resistance. | c. | a downward arrow to represent the force of gravity and an upward arrow
to represent the force of air resistance. | d. | only a downward arrow to represent the force of
gravity. | | |
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34.
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A car goes
forward along a level road at constant velocity. The additional force needed to bring the car into
equilibrium is a. | equal to the normal
force times the coefficient of static friction. | b. | the normal force times
the coefficient of kinetic friction. | c. | zero. | d. | greater than the normal force times the coefficient of static
friction. | | |
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35.
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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. | 9.8
m/s2 | c. | 2.0
m/s2 | b. | 3.0 m/s2 | d. | 6.0 m/s2 | | | | |
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36.
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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. | 65.2
N | c. | 95.6
N | b. | 70.0
N | d. | 53.0
N | | | | |
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37.
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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. | Earth exerts a force on the hand; the hand exerts a force on the
ball. | b. | Earth exerts a force on the ball; the hand exerts a force on
Earth. | c. | The hand exerts a force on the ball; Earth exerts a force on the
hand. | d. | Earth exerts a gravitational force on the ball; the ball exerts a
gravitational force on Earth. | | |
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38.
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Which of the
following forces is an example of a contact force? a. | gravitational
force | c. | frictional
force | b. | electric force | d. | magnetic force | | | | |
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39.
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In the
free-body diagram shown above, which of the following is the gravitational force acting on the
balloon? a. | 5120
N | c. | 1520
N | b. | 950
N | d. | 4050
N | | | | |
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40.
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Which of the
following is the cause of an acceleration or a change in an object’s motion? a. | force | c. | speed | b. | velocity | d. | inertia | | | | |
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41.
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The
magnitude of the force of gravity acting on an object is a. | mass. | c. | frictional
force. | b. | weight. | d. | inertia. | | | | |
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42.
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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. | 3.00 m/s2 | b. | 2.14
m/s2 | c. | 1.41 m/s2 | d. | 5.25
m/s2 | | |
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43.
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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. | 0.740 | c. | 0.116 | b. | 0.540 | d. | 0.470 | | | | |
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44.
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Which are
simultaneous equal but opposite forces resulting from the interaction of two
objects? a. | action-reaction
pairs | c. | gravitational
forces | b. | field forces | d. | net external forces | | | | |
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Short Answer
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45.
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What is the
natural tendency of an object that is in motion?
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46.
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If two teams
playing tug-of-war pull on a rope with equal but opposite forces, what is the net external force on
the rope?
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47.
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State
Newton’s first law of motion.
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48.
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In what
direction does the force of air resistance act?
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49.
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Distinguish
between mass and weight.
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Problem
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50.
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In a game of
tug-of-war, a rope is pulled to the left with a force of 75 N and to the right with a force of 102 N.
What is the magnitude and direction of the net external force on the rope?
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