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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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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2.
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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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3.
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The
basic SI unit of length is the
a. meter. b. foot.
c. inch. d. mile.
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4.
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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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5.
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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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6.
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Speed
equals distance divided by
a. time. b. velocity.
c. size. d. motion.
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7.
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If
the speed of an object does NOT change, the object is traveling at a(n)
a. constant
speed. b. average speed. c. increasing speed.
d. decreasing speed.
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8.
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If a
bicyclist travels 30 kilometers in two hours, her average speed is
a. 30
km/h. b. 60 km/h. c. 15 km/h. d. 2
km/h.
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9.
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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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10.
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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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11.
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When
you know both the speed and the 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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12.
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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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13.
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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. when the object began moving. d. the direction the object is
moving.
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14.
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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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15.
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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 plates move at the same speed as Earth rotates on its
axis.
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16.
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If
one of Earth’s plates moves 5 centimeters every year, how far will it move in 500
years?
a. 25 kilometers b. 25 centimeters
c. 25 meters d. 250 kilometers
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17.
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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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18.
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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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19.
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The
rate at which velocity changes is called
a. speed. b. direction.
c. acceleration. d. motion.
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20.
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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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21.
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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 following a straight flight
path
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22.
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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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23.
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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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24.
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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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25.
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When
two equal forces act on the same object in opposite directions, the net force
is
a. smaller than either force. b. equal to each of the
forces. c. zero. d. greater than either force.
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26.
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The
tendency of an object to resist any change in its motion is known as
a. mass. b. inertia. c. force.
d. balance.
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27.
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The
greater the mass of an object,
a. the easier the object starts
moving. b. the greater its inertia. c. the more balanced it
is. d. the more space it takes up.
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28.
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Force
equals mass times
a. speed. b. motion.
c. acceleration. d. inertia.
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29.
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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 proportionally.
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30.
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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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31.
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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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32.
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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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33.
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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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34.
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Weight equals mass times
a. force
due to balanced forces. b. acceleration due to gravity. c. inertia
due to force. d. air resistance.
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35.
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Objects falling through air experience a type of friction
called
a. terminal velocity. b. air
resistance. c. inertia. d. rolling friction.
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36.
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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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37.
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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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38.
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Which
law can explain how gases released from burning fuel in a rocket produce
thrust?
a. Newton’s first law of motion
b. Newton’s second law of motion c. Newton’s third law of
motion d. the law of conservation of momentum
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39.
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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
mass c. very little air resistance d. more velocity than
friction
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40.
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Any
force that causes an object to move in a circle is called a(n)
a. balanced
force. b. unbalanced force. c. gravitational force.
d. centripetal force.
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Completion
Complete each sentence or
statement.
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41.
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The
distance traveled by a moving object per unit of time is called ____________________.
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42.
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The
basic SI unit of length is the ____________________.
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43.
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The
statement that the motion of a hurricane is 20 kilometers per hour in an easterly direction is a
description of the hurricane’s ____________________.
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44.
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A
speed of 15 kilometers per hour is abbreviated as 15 ____________________.
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45.
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_________________________ occurs when an object slows down.
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46.
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A
golf ball ____________________ when either its speed or its direction changes.
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47.
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The
motion of a car stopping at a traffic light is an example of ____________________ acceleration, also
called deceleration.
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48.
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The
abbreviation of the unit of acceleration (meters per second per second) is
____________________.
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49.
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If a
ship has an acceleration of 3 kilometers per hour per hour, its speed is expressed in the unit
____________________.
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50.
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If a
car is speeding up, its initial speed is ____________________ than its final speed.
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51.
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The
overall force on an object after all the forces are added together is called the ____________________
force.
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52.
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Unbalanced forces acting on an object produce ____________________
motion.
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53.
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One
____________________ is the force required to accelerate 1 kilogram of mass at 1 meter per second per
second.
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54.
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Friction acts in a direction ____________________ to an object’s direction of
motion.
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55.
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The
downward force acting on an object in free fall is the force of ____________________.
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56.
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When
_________________________ equals the force of gravity on a falling object, the object reaches
terminal velocity.
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57.
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As
the distance between two objects decreases, the gravitational force between them
____________________.
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58.
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According to Newton’s third law of motion, the strength of a reaction force is
_________________________ the strength of the action force.
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59.
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The
momentum of a roller skater is not conserved because ____________________ acts on the
skates.
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60.
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During lift-off, the thrust on a rocket is directed
____________________.
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