When is momentum conserved?

When there is no next external force

A combination of all the forces acting on an object

To determine whether a hypotheis is scientifc or not,________________.

look to see if there is a test for proving it wrong

In what direction should a force be applied to produce maximum torque?

Perpendicular to the joining point

Are there any completely friction free surfaces?

No friction is always present however slight.

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Physics Final Exam Review Part 3

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Physics

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Questions 131

Answers

1
Two types of circular motion are rotation and ____________.
Resolute
Resolution
Republic
Revolution
2
A tidal effect causes the surface of Earth to rise and fall as much as _____ meter twice a day.
one sixth
one quarter
one fifth
one half
3
Fill in the blank: The English physicist _____________ first measured G.
Bill Nye
Newton
Cavendish
Copernican
4
Are the perpendicular components of a vector independent of eachother?
Maybe
No
Sometimes
Yes
5
Is the net torque changed when a partner on a seesaw stands from her end instead of sitting?
No
Yes
6
You cover 10 m in a time of 1 sec. Is your speed the same if you cover 20 m in 2 sec?
Yes
No
7
Galileo argued that______________-is a force needed to keep an object moving.
only when friction isn't present
only when copious ammounts of wind resistance is present
only when friction is present
8
Which has greater momentum?
heavy truck at rest
rolling skateboard
they are equal
9
If two players kick the ball at the same time, equal and opposite, what is the net force?
zero
varies on how hard they kicked
the player's kick power added together
the player's power subtracted from each other
10
Generally, the first step in the scentific method is____________.
predict the consequences of the hypothesis
recognize a problem
make an educated guess about the answer
perform experiments to test predictions
11
________between two surfaces depends on the material, and how much surface is pressed together.
The force of inertia
The force of gravity
The force of magnitude
The force of friction
12
Technology is a method of________________.
solving practical problems
answering "what if" questions
distraction
13
The greater an object's rotational inertia the more____ it is to change the rotational speed.
simple
fluid
difficult
14
The only force that is exerted on the whirling can is directed __the center of circular motion.
diagonal to
tangent to
toward
away from
15
Does air resistance increase or decrease the acceleration of a falling object?
Decrease
Increase
16
___________ speed depends on rotational speed and the distance from the axis of rotation.
Medial
Tangential
Linear
Rotational
17
If you have two glasses, one filled with water the other ai,r on an incline which will topple?
The filled one
Neither
Both
The empty one
18
True or False: A new source of energy is hydrogen.
True
False
19
What name is given to the stretching force that occurs in a spring being pulled?
Pressure
Force
Tension
Bounce
20
Is velocity a scalor or vector quantity or neither?
Neither
Vector
Scalor
21
Galileo was born the same year Shakespeare was born and __________ died.
Raphel
Da Vinci
Plato
Michelangelo
22
Fusion will eventually cause the sun to expand into a(n)___________.
Cosmic Ray
Nitrogen Ball
Black Gnome
Red Giant
23
Aristotle studied motion and divided it into two types. One of these is an answer below.
mechanical
world
Violent
static
24
Acceleration is _______ proportional to mass.
directly
inversely
25
When is momentum conserved?
When there is no net external torque
When there is no net internal torque
When there is no next external force
when there is no resistance present
26
What is a NET force?
A combination of all the forces acting on an object
Just one force acting on an object
Two forces cancelling when acting on an object
The words used when no forces are present
27
What is an example of a principal axis of rotation for the human body?
Latitudinal
Transcripted
Transverse
Median
28
If a scientist finds evidence that ___________ a hypothesis, then it must be changed.
focuses on
contradicts
proves
29
True or False: Acceleration is the rate at which velocity itself changes.
True
False
30
The work-energy theorem describes the relationship between which two?
work and gravity
weight and height
height and energy
work and energy
31
What is the equation for power?
work ÷ time
work x time
work - time
work + time
32
What does dynamic mean?
Bouncing
Arobic
Moving
At rest
33
True or False: Rockets work better with air resistance.
False
True
34
To determine whether a hypotheis is scientifc or not,________________.
assume it is wrong then create your own hypothesis
google all possible outcomes of the hypothesis
look to see if there is a test for proving it wrong
35
Kinetic energy depends on _______?
speed tripled
speed squared
speed quartered
speed halved
36
Which word best describes the tangential velocity that stops the moon from hitting Earth?
Upwards
Sideways
Backwards
Downwards
37
True or False? The gravitational influence of every object is exerted through all space.
True
False
38
What two controls on a car cause a change in speed?
Gas Pedal;Speedometer
Break Pedal;Speedometer
Gas Pedal;Break Pedal
39
A moving object can have a large momentum if it has?
all of the above
large mass
high speed
40
True or False? Centrifugal force is a true force.
False
True
41
Define a lever.
a simple machine
a slope for joining two different levels
Both 1 and 2
a bar that turns about a fixed point
42
How does a skater decrease his or her rotational inertia by using arm and leg placement?
Arms and legs out in a cross formation
Tucking arms and legs in
Fanning arms and legs out
Holding hands outward
43
Where is the center of gravity of an object that hangs in equilibrium?
Its lower half
Its geometric center
Its upper half
Its center of mass
44
In what direction should a force be applied to produce maximum torque?
Parallel to the joining point
Perpendicular to the joining point
45
What does the slope of the curve on a velocity-versus-time graph represent?
Distance
Velocity
Time
Acceleration
46
Are there any completely friction free surfaces?
Yes there are many.
Yes, for example a smooth table.
Maybe in some cases.
No friction is always present however slight.
47
For a constant force, an _____ in the mass will result in a _____ in the acceleration.
decrease;decrease
increase;increase
decrease;increase
increase; decrease
48
if you throw a baseball at 20 m/s straight up, how fast will it be when you catch it?
5 m/s
10 m/s
15 m/s
20 m/s
49
______is the name given to the force that acts between materials that touch as they move past.
Friction
Momentum
Acceleration
Force
50
Fill in the blank: Newton realized that the moon must be falling __________ Earth.
next to
around
above
beside
51
Centrifugal force is an ___________________.
effect of tangential speed
effect of rotation
effect of revolution speed
effect of inertia
52
True or False: The vector sum of the momenta is the same before and after a collision.
False
True
53
The property of a body to resist changes to its state of motion is called______.
static
friction
inertia
54
Objects at rest tend to________.
resist forces entirely
do not resist when acted upon
start moving
stay at rest
55
Which will swing back and forth more often, a short pendulum or a long pendulum?
Neither
Long
Short
Inbetween
56
Does a child on a merry-go-round revolve or rotate around the merry-go-round's axis?
Revolve
Rotate
57
What two types of collision is between two freight cars?
inelastic collision
elastic collision
58
To kic a football so that it doesn't rotate through the air, where should it be kicked?
The top
The ground under
The middle
The bottom
59
When do action and reaction forces NOT cancel out?
neither are correct
when they are in the same system
when one is an external force
both are correct
60
What is the universal gravitation constant?
9.81 N
6.67 x 10^-11 Nm^2/kg^2
6.67 x 10^-11 N
9.81 m/s^2
61
What is the name of one force that compresses a spring inside a weighing scale?
Direction
Support Force
Magnitude
Pressure
62
Unbalanced forces acting on an object cause the object to __________.
roll
accelerate
rotate
stop
63
Which of the following is an example of potential energy?
Gravitational
Chemical
All the Above
Elastic
64
Define physics.
Is the study of the human body
Is about the nature of basic things
The study of Earth and it's movements
Is the study of the Solar System
65
Why is the middle seat most comfortable on a bus driving on a bumpy road?
The middle seat has extra cushion in most buses
The bumpiness is directed only to those above tire seats
The passengers next to you obsorb the shock
It is closer to the center so less rocking is felt
66
What is the equation for angular momentum?
Rotational Inertia - Rotational Velocity
Rotational Inertia x Rotational Velocity
Rotational Inertia + Rotational Velocity
Rotational Inertia ÷ Rotational Velocity
67
The ___________ force on an object depends on the object's tangential speed, radius, and mass.
centripetal
rotational
revolution
centrifugal
68
What does the word static mean?
At rest
Dominate
Electric
Moving
69
What part of an object follows a smooth path when the object is made to spin through the air?
The very bottom of the object
The center of mass of the object
The objects exact middle
The very top of the object
70
What is a force?
Air pressure
A push or a pull
A motion
A mass or weight
71
What are the two forms of mechanical energy?
Kinetic and Elastic
Potential and Inelastic
Kinetic and Potential
Nuclear and Solar
72
When the boy jumps to shore from the boat, how does the boat move?
back and forth
It doesn't
backwards
forwards
73
Why should a boxer move with the punch - not into it?
easier to dodge the punch
time of contact would reduce
more impact
74
If you hit a wall with 500 N, how much force does the wall exert on you?
1,000 N
250 N
500 N
50 N
75
Which of the following statement(s) is/are correct showing interaction?
You are pushing on the wall
The wall is pushing on you
All are correct
When you are touching something, it is touching you back
76
True or False? Physics is about the nature of basic things such as motion, forces, etc.
False
True
77
How does speed affect the friction between a road and a skidding tire?
no affect
increases
decreases
78
For a constant force, an ____ in the area of contact will result in a ______ in the pressure
increase;decrease
increase;decrease
increase;increase
decrease;increase
79
When is angular momentum conserved?
When no net external torques acts on an object
When no net internal torque acts on an object
When the net force is cancelled when acting on the object
When there is no net torque acting on the object
80
If it turns about the internal axis it is___________.
linear
revolution
tangential
rotation
81
Science is a method of ______________.
answering math based questions
answering theoretical questions
answering rational thought questions
82
Much of science today is what used to be called ____________.
Unnatural philosophy
Natural philosophy
World philosophy
83
True or False? All freely falling objects fall with the same acceleration.
True
False
84
Star motion and plantary circulation would be under what kind of motion according to Aristotle?
Natural
World
Violent
Cosmic
85
The air resistance force on an object depends on the objects __________.
speed and area
speed and direction
area and velocity
time and velocity
86
Where is the center of mass of Earth's atmosphere?
The center of Earth
Along the Equator
Directed in the poles (North and South)
Directed in fault lines
87
The more mass an object has, the ___its inertia and the ___force it takes to change its motion.
greater; more
greater; less
smaller; less
smaller; more
88
When scientific findings in nature are expressed using math, they are ___________________.
Do not effect experimentation in any sort of way
Harder to verify or disprove by experiment
easier to verify or disprove by experiment
89
What kind of quantity is momentum?
scalar quantity
vector quantity
neither
90
Define elastic collision.
Collision where objects become distorted and generate heat
Answers 1 and 2
Collision without generating heat
collision without permanent deforming
91
On object moving under gravity is the meaning of_______.
Free fall
Inertia
Gravitational pull
92
Who created the Laws of Motion?
Isaac Newton
Galileo Galilei
Nikola Tesla
Albert Einstein
93
True or False: The sun is the source of practically all our energy on Earth.
True
Falso
94
How far below an inital straight line path will a projectile fall in one second?
10 m
5 m
1 m
3 m
95
Which will swing back and forth more often a short or long pendulum?
Long
Short
96
Why does a cannonball undergo more acceleration than the cannon?
the masses
they are in the same systems
friction
gravity
97
Does the speedometer of a car read instantaneous speed or average speed?
Average
Instantaneous
Neither
98
How does the downward component of the motion of a projectile compare with free fall?
They are entirely similar
They are exact opposites
They contradict eachother
They can be exact opposites or entirely similar
99
What is the imaginary straight-line path a projectile falls below equal to?
10t^2
5t^2
9t^2
3t^2
100
Is speed a vector or scalor quantity?
Vector
Neither
Scalor
101
Yes or No? Is this the correct distance formula? d=(1/2)av^2
Yes
No
102
What is linear speed called when something moves in a circle?
Medial
Centrifugal
Revolutional
Tangential
103
What is the downward motion of a horizontally launched projectile the same as?
An object in free fall
An object thrown perfectly downward
A perfectly upward launched projectile
A vertically launched projectile
104
In what ways can a machine alter an input force?
magnitude
direction
speed
friction
105
The scientific method is often credited to_________ and/or Francis Bacon
Newton
Plato
Galileo
Aristotle
106
Can you physically touch a person without them touching you back with the same force?
No
Yes
107
What does Newton's third law describe?
relationship of an objects mass, acceleration, and net force
relationship between two forces in an interaction
that force is not needed to keep an object moving
108
What is the equation for acceleration
net force ÷ mass
mass ÷ net force
net force x mass
net force + mass
109
Earth's gravitational field interacts with objects by causing them to experience _________.
gravitational touches
gravitational pops
gravitational forces
gravitational hiccups
110
How far will an object move in one second if its average speed is 5 m/s?
5m
10m
1m
15m
111
True or False? Circular motion is accelerated motion, which requires a force.
True
False
112
True or False? The weight of a rock at Earth's center is zero.
True
False
113
What quantity is necessary to determine a scalor quantity
Magnitude
Pull
Direction
Pressure
114
What does the diagonal of a constructed parallelogram represent?
a force
friction
A support force
The resultant
115
Newton's first law is usually called________.
law of inertia
action-reaction
law of placement
116
Compared to the lighter kid, should the heavier one sit close or far from the folcrum?
Far
Close
117
A ball is dropped to the ground at the instant a ball is thrown horizontally which lands first?
The same time
The ball thrown horizontally
The ball dropped
118
Which will have the greater acceleration rolling down an incline-a hoop or solid disk?
Equal acceleration
Solid disk
Hoop
119
Copernicus proposed that the ______________.
Sun moved around the Earth
Earth moved around the sun
the Earth was the center of the Solar System
120
What is mechanical advantage for a machine?
input force
none of the above
ratio of output force to input force
output force
121
What would a skater do to decrease his or her rotational inertia while spinning?
Have all able body parts flap up and down
Have his or her arms bent at the joints
Fan his or her arms out
Tuck his or her arms and legs in
122
What does a safety net do for circus acrobats?
increases time interval of contact
reduces the stopping force
all the above
softer landing
123
A cat is lying on the floor. Can you say no force acts on the cat?
Yes
No but only because of gravity
There is a support force and net force acting on the cat
Yes, but only because it is in an equilibrium state
124
True or False: Change in momentum depends on force that acts and the length of time it acts.
False
True
125
If the time of impact in a collision is extended 2 times, how does the force of impact change?
increase 2 times
increase 4 times
decrease 2 times
decrease 4 times
126
The "centrifugal-force effect" is attributed not to any real force but to ________.
momentum
balance
friction
inertia
127
If Earth pulls the ball, which of the following is the reaction?
Earth pulling the ball
the ball pulling Earth
the ball pulling Earth and Earth pulling the ball
128
A large body of information that encompasses verified hypotheses of the world is called?
A scientific hub
A scientific source
A scientific theory
A scientific guess
129
When a bowling ball leaves your hand it might not spin but further down the alley it does, why?
Gravity
Pressure
Torque
Friction
130
What do we call a projectile that continually "falls" around the earth?
A space station
Satelite
An orbiting junction
Shooting star
131
Do objects of the same shape but different sizes accelerate equally when rolled down an incine?
Depends on the incline
No
Yes

Physics Final Exam Review Part 3 Flashcards | StudBud