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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When
an object’s distance from another object is changing, a. | it is in
motion. | b. | it is speeding. | c. | it has a high
velocity. | d. | it is accelerating. | | |
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2.
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The
basic SI unit of length is the a. | meter. | b. | foot. | c. | inch. | d. | mile. | | |
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3.
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Speed
equals distance divided by a. | time. | b. | velocity. | c. | size. | d. | motion. | | |
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4.
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When
you know both the speed and direction of an object’s motion, you know the a. | average speed of
the object. | b. | acceleration of the object. | c. | distance the
object has traveled. | d. | velocity of the object. | | |
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5.
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You
can show the motion of an object on a line graph in which you plot distance against a. | velocity. | b. | time. | c. | speed. | d. | direction. | | |
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6.
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In
graphing motion, the steepness of the slope depends on a. | how quickly or
slowly the object is moving. | b. | how far the object has moved. | c. | the velocity of
the object. | d. | the direction the object is moving. | | |
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7.
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The
upper layer of Earth consists of more than a dozen major pieces called a. | units. | b. | plates. | c. | continents. | d. | tectonics. | | |
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8.
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In
1,000 years, Earth’s plates have moved a. | 5 kilometers. | b. | 50
centimeters. | c. | 50 meters. | d. | 50
kilometers. | | |
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9.
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The
rate at which velocity changes is called a. | speed. | b. | direction. | c. | acceleration. | d. | motion. | | |
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10.
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Which
of these is an example of deceleration? a. | a bird taking off for flight | b. | a baseball
released by a pitcher | c. | a car approaching a red light | d. | an airplane
turning to change its course | | |
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11.
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To
determine the acceleration rate of an object, you must calculate the change in velocity during each
unit of a. | speed. | b. | time. | c. | motion. | d. | deceleration. | | |
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12.
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If
velocity is measured in kilometers per hour and time is measured in hours, the unit of acceleration
is a. | hours. | b. | kilometers per hour. | c. | kilometers per
hour per hour. | d. | kilometers. | | |
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13.
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A
train that travels 100 kilometers in 4 hours is traveling at what average speed? a. | 50
km/h | b. | 100
km/h | c. | 2
km/h | d. | 25
km/h | | |
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14.
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As
Earth orbits the sun, it is moving about a. | 30 kilometers per hour. | b. | 300 kilometers
per second. | c. | 3 kilometers per minute. | d. | 30 kilometers
per second. | | |
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15.
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A
place or object used for comparison to determine if something is in motion is called a. | a
position. | b. | a reference point. | c. | a
constant. | d. | velocity. | | |
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16.
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Gallons, inches, and pounds are all a. | distances. | b. | reference points. | c. | units. | d. | velocities. | | |
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17.
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On a
graph showing distance versus time, a horizontal line represents an object that is a. | moving at a
constant speed. | b. | increasing its speed. | c. | decreasing its
speed. | d. | not moving at all. | | |
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18.
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The
International System of Units is used a. | only in the United States. | b. | only in
France. | c. | in most of Europe. | d. | all over the
world. | | |
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19.
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According to the theory of plate tectonics, a. | Earth’s
crust is made of molten lava. | b. | Earth’s plates move ever so
slowly. | c. | Earth’s surface has not changed over
time. | d. | Earth’s core is magnetic. | | |
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20.
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Scientists believe that all continents were connected as recently as a. | 250 years
ago. | b. | 25,000 years
ago. | c. | 250 million
years ago. | d. | 25 years ago. | | |
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21.
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If
you know the distance an object has traveled in a certain amount of time, you can
determine a. | the size of the
object. | b. | the speed of the object. | c. | the location of
the object. | d. | the velocity of the object. | | |
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22.
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In a
conversion factor, what is special about the fraction used? a. | The denominator
is always 1. | b. | The numerator is always 1. | c. | The denominator
and numerator are equal. | d. | The denominator is always zero. | | |
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23.
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It is
rare for any motion to a. | stay the same for very long. | b. | change
quickly. | c. | increase in velocity. | d. | decrease in
speed. | | |
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24.
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If
the speed of an object does NOT change, the object is traveling at a a. | constant
speed. | b. | average speed. | c. | increasing
speed. | d. | decreasing speed. | | |
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25.
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Changing direction is an example of a kind of a. | acceleration. | b. | speed. | c. | velocity. | d. | constant rate. | | |
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26.
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If a
bicyclist travels 30 kilometers in two hours, her average speed would be a. | 30
km/h. | b. | 60 km/h. | c. | 15
km/h. | d. | 2 km/h. | | |
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27.
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The
moon accelerates because it is a. | in a vacuum in space. | b. | continuously
changing direction. | c. | a very large sphere. | d. | constantly
increasing its speed of orbit. | | |
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28.
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If an
object moves in the same direction and at a constant speed for 4 hours, which of the following is
true? a. | The
object’s speed changed during the 4 hours. | b. | The
object’s speed and average speed were equal during the entire 4 hours. | c. | The object
accelerated during the 4 hours. | d. | The object decelerated during the 4
hours. | | |
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29.
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If
you know a car traveled 300 kilometers in 3 hours, you can find its a. | acceleration. | b. | direction. | c. | average
speed. | d. | velocity. | | |
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30.
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In an
acceleration graph showing speed versus time, a straight line shows the acceleration
is a. | decreasing. | b. | increasing. | c. | changing. | d. | constant. | | |
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31.
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Which
of the following is an example of exerting a force? a. | a child running
through a field | b. | a train speeding down a track | c. | a carpenter
hammering a nail | d. | an airplane soaring through the sky | | |
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32.
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What
happens when two forces act in the same direction? a. | They cancel each
other out. | b. | The stronger one prevails. | c. | They add
together. | d. | Their sum divided by two is the total
force. | | |
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33.
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The
tendency of an object to resist change in its motion is known as a. | mass. | b. | inertia. | c. | force. | d. | balance. | | |
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34.
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The
greater the mass of an object, a. | the more force it can exert. | b. | the greater its
inertia. | c. | the more balanced it is. | d. | the more space
it takes up. | | |
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35.
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Force
= mass • a. | speed. | b. | motion. | c. | acceleration. | d. | inertia. | | |
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36.
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One
way to increase acceleration is by a. | increasing mass. | b. | decreasing
mass. | c. | decreasing force. | d. | increasing both
force and mass equally. | | |
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37.
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The
force that one surface exerts on another when the two rub against each other is
called a. | friction. | b. | acceleration. | c. | inertia. | d. | gravity. | | |
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38.
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Which
of the following is an example of rolling friction? a. | your shoes on a
sidewalk as you walk | b. | bike tires on the road as you ride | c. | a boat on the
water as it sails | d. | two hands rubbing together | | |
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39.
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When
the only force acting on a falling object is gravity, the object is said to be a. | stationary. | b. | decelerating. | c. | in free
fall. | d. | a projectile. | | |
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40.
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Air
resistance is a type of a. | motion. | b. | acceleration. | c. | velocity. | d. | friction. | | |
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41.
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The
force of gravity on a person or object at the surface of a planet is known as a. | mass. | b. | inertia. | c. | air
resistance. | d. | weight. | | |
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42.
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Weight = mass • a. | force due to balanced forces. | b. | acceleration due
to gravity. | c. | inertia due to force. | d. | air
resistance. | | |
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43.
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The
law of universal gravitation states that any two objects in the universe, without
exception, a. | attract each
other. | b. | repel each other. | c. | combine to
provide a balanced force. | d. | create friction. | | |
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44.
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If
you were on the moon, your weight would be roughly what fraction of your weight on
Earth? a. | one
third | b. | one fourth | c. | one
fifth | d. | one sixth | | |
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45.
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Two
figure skaters who push off of each other will move at the same speed if a. | they push with
the same force. | b. | the ice does not cause any friction. | c. | there is no air
resistance. | d. | they have the same mass. | | |
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46.
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Forces can be added together only if they are a. | acting on the
same object. | b. | balanced forces. | c. | unaffected by
gravity. | d. | substantial. | | |
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47.
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The
product of an object’s mass and velocity is called its a. | inertia. | b. | momentum. | c. | acceleration. | d. | force. | | |
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48.
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According to the law of conservation of momentum, when two objects collide in the
absence of friction, a. | velocity decreases. | b. | velocity
increases. | c. | momentum is not lost. | d. | only the object
with the larger mass continues on. | | |
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49.
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The
achievement of lifting a rocket off the ground and into space can be explained by a. | Newton’s
first law. | b. | Newton’s second law. | c. | Newton’s
third law. | d. | the law of conservation of momentum. | | |
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50.
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What
is required for a rocket to lift off into space? a. | thrust that is greater than Earth’s
gravity | b. | mass that is greater than
Earth’s | c. | very little air resistance | d. | more velocity
than friction | | |
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51.
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An
object that travels around another object in space is called a a. | projectile. | b. | inertia. | c. | mass. | d. | satellite. | | |
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52.
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Any
force that causes an object to move in a circle is called a a. | balanced
force. | b. | unbalanced force. | c. | gravitational
force. | d. | centripetal force. | | |
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53.
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In
physical science, a push or a pull is called a(n) a. | force. | b. | acceleration. | c. | inertia. | d. | motion. | | |
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54.
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The
momentum of an object is in the same direction as its a. | force. | b. | acceleration. | c. | velocity. | d. | inertia. | | |
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55.
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How
can you increase the momentum of an object? a. | by decreasing its velocity | b. | by increasing
its mass | c. | by increasing its friction | d. | by decreasing
its acceleration | | |
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56.
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The
amount of matter in an object is called its a. | inertia. | b. | mass. | c. | force. | d. | balance. | | |
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57.
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Which
of the following is an example of increasing friction intentionally? a. | waxing
skis | b. | adding grease to
gears on a bike | c. | throwing sand on an icy driveway | d. | oiling a squeaky
door | | |
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58.
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The
force that pulls falling objects toward Earth is called a. | gravity. | b. | free fall. | c. | acceleration. | d. | air resistance. | | |
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59.
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A
leaf flutters instead of dropping straight to the ground when it falls from a tree because it
experiences a. | terminal
velocity. | b. | air resistance. | c. | inertia. | d. | rolling friction. | | |
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60.
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According to Newton’s third law of motion, when a hammer strikes and exerts force
on a nail, the nail a. | creates a friction with the hammer. | b. | disappears into
the wood. | c. | exerts an equal force back on the
hammer. | d. | moves at a constant speed. | | |
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