Multiple Choice
Identify the
choice that best completes the statement or answers the question.
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1.
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An airplane is flying at 635 km per hour at an altitude of 35,000 m. It is
currently over Kansas and is approximately 16 minutes ahead of its scheduled arrival time. What is
its velocity?
a. | 635 km/h | b. | 16 m/min | c. | 35 000
m/s | d. | This cannot be determined without further information about its
direction. |
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2.
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The SI unit for speed is
a. | mph. | c. | m/s. | b. | ft/s2. | d. | Dv /
t. |
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3.
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On a speed-time graph, a line with a negative slope indicates that the object
is
a. | speeding up. | c. | not moving. | b. | slowing down. | d. | traveling at a constant
speed. |
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4.
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The combination of all of the forces acting on an object is called the
a. | total force. | c. | super force. | b. | union of forces. | d. | net force. |
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5.
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If the net force acting on a stationary object is zero, then the object
will
a. | accelerate in the direction of the strongest force. | b. | remain at
rest. | c. | begin moving backwards. | d. | decelerate at a steady rate of
speed. |
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6.
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If the net force on an object is zero then the object has
a. | reaction forces. | c. | balanced forces. | b. | action forces. | d. | unbalanced
forces. |
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7.
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A tug-of-war that results in one team pulling the other across the line is an
example of
a. | action forces. | c. | balanced forces. | b. | reaction forces. | d. | unbalanced
forces. |
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8.
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Which of the following best illustrates balanced forces?
a. | a rock falling to the ground | b. | a stretched rubber band being held between two
hands | c. | a person lifting a heavy box off of the ground | d. | a crash between a
large truck and a train |
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9.
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A force is continuously applied to an object, causing it to accelerate. After a
period of time, however, the object stops accelerating. What conclusion can be drawn?
a. | The mass of the object has increased. | b. | Gravity on the object has
increased. | c. | The object is experiencing some kind of friction. | d. | The momentum of the
object has reached a maximum. |
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10.
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Which of the following statements is true?
a. | Frictional forces are greatest when both surfaces are rough. | b. | When a truck is
parked on a hill, friction pulls the truck down the hill. | c. | Air resistance
always opposes friction. | d. | Friction can exist between two objects even
when they are not in contact. |
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11.
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An object is in motion when
a. | you observe the object move. | b. | the object’s speed
increases. | c. | the object’s displacement is greater than the distance
traveled. | d. | the object changes position relative to a stationary reference
point. |
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12.
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Which straight-line acceleration indicates an increase in speed?
a. | 0 m/s2 | c. | 4 m/s2 | b. | -15
m/s2 | d. | All of the
above |
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13.
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How can the friction on a water slide be reduced?
a. | warm the surface of the slide | b. | keep the surface of the slide
dry | c. | run a constant stream of water down the slide | d. | increase the slope
of the slide |
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14.
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Which is an example of balanced forces acting on an object?
a. | a kangaroo jumping | c. | a cyclist slowing down | b. | a car turning a
corner | d. | a leaf lying on the
grass |
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15.
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A car is parked on a hill. In order to keep the car from rolling downhill, how
great must the static friction acting on the car be?
a. | equal to the force pulling the car downhill | b. | greater than the
force pulling the car downhill | c. | greater than the force pulling the car
uphill | d. | smaller than the force pulling the car uphill |
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16.
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An object that changes position relative to a reference point is
a. | stationary. | c. | moving at constant speed. | b. | in
motion. | d. | moving at constant
velocity. |
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17.
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Average speed can be represented by the mathematical expression
a. | distance/time. | c. | time –
distance. | b. | distance ´ time. | d. | time +
distance. |
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18.
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The _____ of an object consists of its speed and direction.
a. | velocity | c. | average speed | b. | instantaneous speed | d. | displacement |
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19.
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The average speed of a runner who runs 500.0 m in 1.6 min is
a. | 0.19 m/s. | c. | 96 m/s. | b. | 5.2 m/s. | d. | 312 m/s. |
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20.
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On a distance vs. time graph of an object’s motion, distance is
usually
a. | plotted on the x-axis. | c. | the dependent
variable. | b. | greater than time. | d. | measured in ft/min. |
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21.
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A pitcher throws a baseball to home plate, a distance of 60.5 ft. The ball
reaches home plate in 0.63 s. What is the velocity of the ball?
a. | 38 ft/s | c. | 96 ft/s | b. | 38 ft/s toward home plate | d. | 96 ft/s toward home
plate |
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22.
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When the motion of an object is shown by a straight line on a distance vs. time
graph with distance on the y-axis, the slope of the line is the
a. | distance traveled. | c. | speed. | b. | displacement. | d. | time of travel. |
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23.
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Speeding up, slowing down, and changing direction is best described as
a. | velocity. | c. | displacement. | b. | distance. | d. | acceleration. |
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24.
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When centripetal acceleration occurs, an object
a. | speeds up. | c. | changes direction. | b. | slows down. | d. | is stationary. |
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25.
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The equation for finding average acceleration for straight-line motion is
a. | initial velocity – final velocity ´
time. | b. | final velocity – initial velocity/time. | c. | initial velocity +
final velocity + time. | d. | initial velocity + final velocity –
time. |
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26.
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Moving from 0 m/s to 25 m/s in 8.0 s equals an average acceleration of
a. | 0.32 m/s. | c. | 3.1 m/s. | b. | 0.32 m/s2. | d. | 3.1
m/s2. |
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27.
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Peter runs in a constant direction on a straight road. The velocity vs. time
graph of Peter’s motion shows a straight line with a negative slope. What does the line tell
you about Peter’s speed?
a. | It is increasing. | c. | It is decreasing, then increasing. | b. | It is
decreasing. | d. | It is
constant. |
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28.
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When velocity changes by the same amount over each time interval, acceleration
is
a. | zero. | c. | positive. | b. | constant. | d. | negative. |
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29.
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On a velocity vs. time graph, what shows the value of the acceleration?
a. | the slope of the line | c. | the y-axis | b. | the x-axis | d. | the final
velocity |
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30.
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What happens when a car slows down and velocity changes?
a. | positive acceleration | c. | negative acceleration | b. | resultant
acceleration | d. | constant
acceleration |
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31.
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Net force is
a. | the force acting in the same direction as an object’s
movement. | b. | the force acting in the opposite direction of an object’s
movement. | c. | the combination of all the forces acting on an object. | d. | the force of gravity
pulling an object down. |
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32.
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An object experiencing balanced forces
a. | has a net force of zero. | c. | is slowing
down. | b. | is speeding up. | d. | stops moving. |
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33.
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A game of tug-of-war is an example of
a. | rolling friction. | c. | streamlining. | b. | air resistance. | d. | unbalanced
forces. |
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34.
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Which is an example of static friction?
a. | pulling a skier behind a boat | c. | braking a car going down a
hill | b. | pushing a box that is at rest | d. | driving a car up a
hill |
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35.
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Which is not an example of sliding friction?
a. | ice skating on a frozen pond | c. | rolling a ball across a
desk | b. | taking notes with a pencil | d. | pushing a book across a table |
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36.
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In order to increase a car’s speed, the force pushing it forward must
be
a. | a negative force. | c. | fundamental friction. | b. | rolling
friction. | d. | kinetic
friction. |
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37.
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The friction between objects that are stationary is called
a. | static friction. | c. | fundamental friction. | b. | rolling
friction. | d. | kinetic
friction. |
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38.
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Which is an example of helpful friction?
a. | wearing batting gloves | c. | applying the brakes on a car | b. | sprinkling sand on
an icy road | d. | All of the
above |
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39.
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Which of the following requires friction?
a. | cleaning a pan | c. | skiing | b. | writing a letter | d. | All of the
above |
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40.
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Using lubricants on engine parts is an example of reducing
a. | force. | c. | acceleration. | b. | friction. | d. | motion. |
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41.
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The distance traveled by an object divided by the time it takes to travel that
distance is called
a. | average velocity. | c. | average acceleration. | b. | average
speed. | d. | negative
acceleration. |
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42.
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On a distance vs. time graph, the line of an object at rest is a
a. | curved line with a slope of zero. | c. | jagged line with a negative
slope. | b. | flat line with a slope of zero. | d. | curved line with a positive
slope. |
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43.
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The difference between speed and velocity is that velocity includes
a. | direction. | c. | time. | b. | distance. | d. | weight. |
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44.
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An example of helpful friction is
a. | car tires wearing out. | c. | writing on paper with a pen. | b. | getting holes in
your socks. | d. | scraping your
knee on the floor. |
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45.
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Friction is defined as the
a. | force that opposes motion between two surfaces that are touching. | b. | rate at which
velocity changes. | c. | resistance of an object to a change in its
velocity. | d. | speed of an object in a particular direction. |
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46.
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An object is in motion when
a. | the net force acting on the object is zero. | b. | friction
occurs. | c. | the object’s displacement is greater than the distance
traveled. | d. | the object changes position relative to a frame of
reference. |
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47.
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Force is a quantity made up of
a. | weight and speed. | c. | time and acceleration. | b. | magnitude and
direction. | d. | mass and
velocity. |
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48.
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Which is an example of balanced forces acting on an object?
a. | a kangaroo jumping | c. | a car turning a corner | b. | a car turning a
corner | d. | a person pushing a
sofa |
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49.
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Acceleration is defined as the change in velocity divided by
a. | speed. | c. | time. | b. | final velocity. | d. | distance. |
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50.
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Which is an example of kinetic friction?
a. | friction between a car’s windshield and the air as you drive into the
wind | b. | friction between your shoes and the ground when you stand still | c. | friction between a
sticky note and the page of a book as it marks your place | d. | friction between
your skin and a pencil as it rests in your palm |
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51.
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In order to determine speed, you must know
a. | only time. | c. | both time and distance. | b. | only
distance. | d. | neither time nor
distance. |
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52.
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When an object slows down, its acceleration is
a. | positive. | c. | negative. | b. | centripetal. | d. | constant. |
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53.
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If the net force acting on a stationary object is zero, then the object
will
a. | accelerate in the direction of the strongest force. | b. | remain at
rest. | c. | begin moving backwards. | d. | decelerate at a steady rate of
speed. |
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54.
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Displacement
a. | must be in a particular direction. | b. | is the change in position of an
object. | c. | must be a straight line. | d. | All of the
above |
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55.
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The force of gravity, the electromagnetic force, the strong nuclear force, and
the weak nuclear force are considered
a. | centripetal forces. | c. | resultant forces. | b. | frames of reference. | d. | fundamental
forces. |
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56.
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On a speed vs. time graph, constant acceleration is represented by a
a. | straight line. | c. | jagged line. | b. | slightly sloped line. | d. | steeply sloped
line. |
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57.
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The friction between the bristles of your toothbrush and the surfaces of your
teeth is an example of
a. | rolling friction. | c. | helpful friction. | b. | static friction. | d. | All of the
above |
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58.
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Which straight-line acceleration indicates an increase in speed?
a. | 0 m/s2 | c. | 4 m/s2 | b. | –15 m/s2 | d. | All of the
above |
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