Why do physicists use models?

to explain the basic features of complex phenomena

Which of the following is an example of projectile motion?

a bullet being fired from a gun

Which of the following statements does NOT describe force?

Force causes objects at rest to remain stationary.

When there is no air resistance, objects of different masses

fall with equal accelerations with similar displacements.

Which of the following is NOT an example of projectile motion?

a hot-air balloon drifting toward Earth

Which would fall with greater acceleration in a vacuum, a leaf or a stone?

they would accelerate at the same time

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Physics Final

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Questions 87

Answers

1
Which of the following is a physical quantity that has a magnitude but no direction?
resultant
frame of reference
scalar
vector
2
Which expression has the same dimensions as an expression yielding a value for acceleration (m/s2)? Δv has units of m/s.
Δv2 ⁄ Δt
Δv ⁄ Δt2
Δv ⁄ Δx2
Δv2 ⁄ Δx
3
Why do physicists use models?
to explain the basic features of complex phenomena
to describe all aspects of a phenomenon
to explain the complex features of simple phenomena
to describe all of reality
4
The SI base unit for time is
1 minute
1 second
1 day
1 hour
5
The magnitude of the force of gravity acting on an object is
mass
frictional force
inertia
weight
6
What does the graph above illustrate about acceleration?
The acceleration is zero.
The acceleration varies.
The acceleration is constant.
The acceleration increases then becomes constant.
7
Objects that are falling toward Earth move
at a constant velocity
slower then faster
slower and slower
faster and faster
8
A dolphin swims 1.85 km/h. How far has the dolphin traveled after 0.60 h?
0.63 km
3.7 km
2.5 km
1.1 km
9
Which of the following is an example of projectile motion?
a bullet being fired from a gun
a jet lifting off a runway
dropping an aluminum can into the recycling bin
a space shuttle orbiting Earth
10
Which of the following is the cause of an acceleration or a change in an object’s motion?
speed
inertia
velocity
force
11
In the free-body diagram shown above, which of the following is the gravitational force acting on the balloon?
4050 N
950 N
1520 N
5120 N
12
A race car accelerates from 0 m/s to 30.0 m/s with a displacement of 45.0 m. What is the vehicle's acceleration?
15.0 m/s2
2.00 m/s2
5.00 m/s2
10.0 m/s2
13
Which of the following is the motion of objects moving in two dimensions under the influence of gravity?
horizontal velocity
projectile motion
parabola
directrix
14
Which of the following is an area of physics that studies heat and temperature?
optics
mechanics
quantum mechanics
thermodynamics
15
What two dimensions, in addition to mass, are commonly used by physicists to derive additional
length and width
velocity and time
area and mass
length and time
16
Which of the following is a physical quantity that has both magnitude and direction?
frame of reference
resultant
vector
scalar
17
Which of the following statements does NOT describe force?
Force causes objects to start moving.
Force causes objects to stop moving.
Force causes objects at rest to remain stationary.
Force causes objects to change direction.
18
A measure of the quantity of matter is
density
mass
force
weight
19
What is the path of a projectile?
a parabola
projectiles do not follow a predictable path
a hyperbola
a wavy line
20
Acceleration due to gravity is also called
free-fall acceleration.
negative velocity.
instantaneous velocity.
displacement.
21
If a nonzero net force is acting on an object, then the object is definitely
movinf with a constant velocity
at rest
losing mass
being accelerated
22
Five darts strike near the center of a target. The dart thrower is
neither accurate nor precise
pecise
both accurate and precise
accurate
23
When there is no air resistance, objects of different masses
fall with equal accelerations with similar displacements.
fall with different accelerations with similar displacements.
fall with equal accelerations with different displacements.
fall with different accelerations with different displacements.
24
According to the scientific method, why does a physicist make observations and collect data?
to make a conclusion
to decide which part of a problem are important
to ask a question
to solve all problems
25
Work is done when
the force and displacement are perpendicular
the displacement is zero
the displacement is not zero
the force is zerot
26
Answer
D
C
B
A
27
Which of the following is an area of physics that studies motion and its causes?
optics
thermodynamics
quantum mechanics
mechanics
28
The SI base unit used to measure mass is the
meter
liter
second
kilogram
29
Which of the following is the tendency of an object to maintain its state of motion?
force
acceleration
velocity
inertia
30
Which are simultaneous equal but opposite forces resulting from the interaction of two objects?
gravitational forces
field forces
net external forces
action-reacton pairs
31
If some measurements agree closely with each other but differ widely from the actual value, these measurements are
precise but not accurate.
neither precise nor accurate
accurate but not precise
acceptable as a new standard of accuracy
32
Answer
vector, scalar, scalar
scalar, scalar, vector
vector, scalar, vector
scalar, vector, scalar
33
A small force acting on a human-sized object causes
a large acceleration
a small acceleration
equilibrium
no acceleration
34
Which of the following is the expression for average velocity?
V avg = Δx/Δt
V avg = Vi + Vf / 2
Vavg = Δx∙Δt
V avg = Δt/Δv
35
Answer
A
C
B
D
36
A force does work on an object if a component of the force
A
D
B
C
37
Which of the following is NOT an example of projectile motion?
a baseball hit by a bat
a long jumper in action
a hot-air balloon drifting toward Earth
a volleyball served over a ne
38
Which would fall with greater acceleration in a vacuum, a leaf or a stone?
they would accelerate at the same time
the leaf
it is difficult to determine without more information
the stone
39
he Greek letter sigma, Σ, indicates a(n)
inverse proportion
sum or total
difference or change
direct proportion
40
Answer
B
D
A
C
41
What is the symbol for mass?
m
Δm
M
m
42
In the steps of the scientific method, what is the next step after formulating and objectively testing hypothesis?
conducting experiments
interpreting results
stating conclusions
making observations and collecting data
43
The most appropriate SI unit for measuring the length of an automobile is the
meter
centimeter
millimeter
kilometer
44
A change in the force of gravity acting on an object will affect the object’s
frictional force
inertia
mass
weight
45
Which of the following forces is an example of a contact force?
magnetic force
electric force
frictional force
gracvitational force
46
answer
A
C
D
B
47
What is the average power supplied by a 60.0 kg secretary running up a flight of stairs rising vertically 4.0 m in 4.2 s
670 W
610 W
380 W
560 W
48
Answer
D
B
C
A
49
Answer
B
D
A
C
50
Answer
C
D
B
A
51
What is the speed of an object at rest?
0.0 m/s
9.8 m/s
9.81 m/s
1.0 m/s
52
According to the scientific method, how does a physicist formulate and objectively test hypotheses?
by stating conclusions
by defending an opinion
by interpreting graphs
by experiments
53
The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of motion?
third
fourth
second
first
54
Which of the following does NOT exhibit parabolic motion?
a basketball thrown to a hoop
a baseball thrown to home plate
a frog jumping from land into water
a flat piece of paper released from a window
55
Which of the following is a value for the acceleration of objects in free fall?
9.81 m/s2
–9.80 m/s2
9.80 m/s2
–9.81 m/s2
56
Which of the following is an example of a vector quantity?
mass
volume
temperature
velocity
57
What causes a moving object to change direction?
velocity
inertia
acceleration
force
58
What does the graph above illustrate about acceleration?
The acceleration is zero.
The acceleration is constant.
There is not enough information to answer.
The acceleration decreases.
59
A baker makes a loaf of bread. Identify the area of physics that this involves.
mechanics
thermodynamics
optics
relativity
60
Which of the following units are used to measure free fall?
m2/s2
m/s2
m/s
m∙s
61
Listening to your favorite radio station involves which area of physics?
relativity
thermodynamics
vibrations and wave phenomena
optic
62
Which of the following forces arises from direct physical contact between two objects?
gravitational force
field force
fundamental force
contact force
63
Answer
62 m
55 m
43 m
75 m
64
Diagrams are NOT designed to
label parts of a model.
show setups of experiments.
show relationships between concepts.
measure an event or situation.
65
In the free-body diagram shown above, which of the following is the gravitational force acting on the car?
13 690 N
5800 N
14 700N
775 N
66
The symbols for units of length in order from smallest to largest are
mm, m, cm, and km
mm, cm, m, and km.
m, cm, mm, and km.
km, mm, cm, and m
67
The more powerful the motor is,
the greater the ability to do the work is.
the longer the time interval for doing the work is.
the shorter the workload is.
the shorter the time interval for doing the work is.
68
In the free-body diagram show above, the 5800 N force represents
the force exerted by a towing cable on the car.
the upward force the road exerts on the car.
the gravitational force acting on the car.
the backward force the road exerts on the car.
69
The symbol mm represents a
megameter
millimiter
micrometer
manometer
70
The Greek letter delta, Δ, indicates a(n)
difference or change
sum of total
inverse proportion
direct propotiion
71
Which of the following is the rate at which energy is transferred?
kinetic energy
potential energy
mechanical energy
power
72
A hiker uses a compass to navigate through the woods. Identify the area of physics that this involves.
quantum mechanics
relativity
elctromagnestism
thermodynamics
73
Which of the following exhibits parabolic motion?
a person diving into a pool from a diving board
a leaf falling from a tree
a train moving along a flat track
a space shuttle orbiting Earth
74
According to the scientific method, how should conclusions be stated?
so that it works with only one set of data
so that it is completely correct, with no mistakes
so that no one can refute the conclusion
in a form that can be evaluated by others
75
Which of the following forces exists between objects even in the absence of direct physical contact?
field force
fundamental force
contact force
frictional force
76
Answer
D
A
B
C
77
Which of the following forces is an example of a field force?
tension
frictional force
gravitational force
normal force
78
Which of the following is the expression for acceleration?
a = Vi - Vf / ti - tf
a = Δt/Δv
a = Δv/Δt
a = Δt∙Δv
79
Which would hit the ground first if dropped from the same height in a vacuum, a feather or a metal bolt?
they would be suspended in a vacuum
the feather
the metal bolt
they would hit the ground at the same time
80
Answer
scalar, scalar, vector
scalar, vector, vector
vector, scalar, scalar
vector, scalar, vector
81
Acceleration is
displacement
the rate of change of displacement
velocity
the rate of change of velocity
82
Answer
D
C
B
A
83
Answer
A
D
B
C
84
A hockey stick hits a puck on the ice. Identify an action-reaction pair, and compare the forces exerted by each object.
The stick exerts a force on the ice; the ice exerts a force on the puck.
The stick exerts a force on the puck; the puck exerts a force on the ice.
The stick exerts a force on the puck; the puck exerts a force on the stick.
The puck exerts a force on the stick; the stick exerts a force on the ice.
85
What is the average power output of a weight lifter who can lift 250 kg 2.0 m in 2.0 s?
4.9 kW
2.5 kW
9.8 kW
5.0 × 10^2 W
86
Answer
C
B
D
A
87
A soccer ball is kicked horizontally. What is its average speed if its displacement is 21.0 m after 4.00 s?
14.4 m/s
2.63 m/s
5.25 m/s
8.75 m/s

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