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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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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2.
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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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3.
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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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4.
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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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5.
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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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6.
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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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7.
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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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8.
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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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9.
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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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10.
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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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11.
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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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12.
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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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13.
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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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14.
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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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15.
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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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16.
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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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17.
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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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18.
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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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19.
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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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20.
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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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21.
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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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22.
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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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23.
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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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24.
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Force
= mass • a. | speed. | b. | motion. | c. | acceleration. | d. | inertia. | | |
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25.
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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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26.
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Air
resistance is a type of a. | motion. | b. | acceleration. | c. | velocity. | d. | friction. | | |
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27.
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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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28.
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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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29.
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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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30.
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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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Completion
Complete each sentence or statement using the
following word bank.Hint: some words are repeated in the word bank and will be correct in multiple
answers.
Word
Bank
gravity
equal to
satellite
upward
opposite
direction
newton
direction
projectile
mass
fluid
net
friction
accelerated
air resistance
mass
increases
opposite
newton inertia
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31.
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A
measure of an object’s ____________________ is a measure of the object’s
inertia.
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32.
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As
the distance between two objects decreases, the gravitational force between them
____________________.
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33.
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If
the action force of a bat striking a ball accelerates the ball in one direction, the reaction force
accelerates the bat in the ____________________ direction.
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34.
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The
momentum of a roller skater is not conserved because ____________________ acts on the
skates.
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35.
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A
person traveling in a car that stops suddenly keeps moving forward due to
____________________.
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36.
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One
____________________ is the force required to accelerate one kilogram of mass at 1 meter per second
per second.
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37.
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The
metric unit that is most often used to describe weight is the ____________________.
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38.
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When
____________________ equals the force of gravity on a falling object, the object reaches terminal
velocity.
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39.
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Unbalanced forces acting on an object produce ____________________
motion.
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40.
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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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41.
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Wet
pavement is more slippery than dry pavement because the force needed to overcome ____________________
friction is less than the force needed to overcome sliding friction.
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42.
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During lift-off, the thrust on a rocket is directed
____________________.
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43.
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The
force of gravity between you and Earth is greater than the force of gravity between you and a car
because Earth has more ____________________ than the car.
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44.
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The
moon is a natural ____________________ of Earth.
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45.
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A(n)
____________________ is an object that is thrown.
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46.
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The
downward force acting on an object in free fall is the force of ____________________.
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47.
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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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48.
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The
force of gravity is responsible for continuously changing the ____________________ in which a
satellite moves.
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49.
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The
momentum of an object is in the same ____________________ as its velocity.
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50.
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Friction acts in a direction ____________________ to an object’s direction of
motion.
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Modified True/False
Indicate
whether the sentence or statement is true or false.
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51.
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The
force that keeps a satellite in Earth orbit is always directed away from the center of
Earth.
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52.
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A
unit of momentum is kg•m/s.
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53.
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When
the only force acting on a falling object is air resistance, the object is said to be in free
fall.
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54.
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A
rocket will move upward as long as the thrust is greater than the pull of
gravity.
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55.
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The
force of gravity decreases as the masses of objects increase.
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56.
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According to Newton’s second law of motion, force equals mass times
weight.
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57.
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Unbalanced forces maintain motion at constant velocity.
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58.
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Friction depends on the types of surfaces involved and how hard the surfaces
push together.
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59.
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Newton’s third law of motion explains that forces act alone.
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60.
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The
property of matter that resists a change in motion is called inertia.
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