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Physics Exam
Physics Exam
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1
A passenger on a bus moving east sees a man standing on a curb. From the passenger’s perspective, the man appears to
move west at a speed that is equal to the bus’s speed.
move east at a speed that is equal to the bus’s speed.
2
Two billiard balls collide. What is the kinetic energy after the collision compared to before the collision?
Four times as great
Unchanged
3
In the steps of the scientific method, what is the next step after formulating and objectively testing hypotheses?
stating conclusions
interpreting results
4
Which of the following forces arises from direct physical contact between two objects?
Contact force
Gravitational force
5
Which statement about models is not correct?
Models describe only part of reality.
Models manipulate a single variable or factor in an experiment.
6
The most appropriate SI unit for measuring the length of an automobile is the
nanometer.
Meter
7
Which of the following exhibits parabolic motion?
A stone thrown into a lake
A leaf falling from a tree
8
Newton’s law of universal gravitation
can be used to derive Kepler’s third law of planetary motion.
does not apply to Kepler’s laws of planetary motion.
9
What quantity measures the output force of a machine relative to the input force?
Mechanical advantage
Leverage
10
A hammer drives a nail into a piece of wood. Identify an action-reaction pair in this situation.
Hammer exerts force on nail; nail exerts force on hammer
Hammer exerts force on nail; hammer exerts force on wood
11
The main difference between kinetic and potential energy is
Kinetic energy involves position;potential energy involves motion
Kinetic energy involves motion;potential energy involves position
12
Which of the following is an area of physics that studies motion and its causes?
mechanics
optics
13
Which of the following statements does not describe force?
Force causes objects at rest to remain stationary.
Force causes objects to stop moving.
14
In this text, which of the following symbols represents gravitational field strength?
g
G
15
Whichof thefollowingformulas would be used todirectly calculate thekinetic energy of anobject with mass m and constant k
KE =1/2mv^2
KE=-1/2kx^2
16
The change in an object’s momentum is equal to
the product of the mass of the object and the time interval.
the product of the force applied to the object and the time interval.
17
A weather balloon records the temperature every hour. From the table above, the temperature
Increases
Decreases
18
Ball with a momentum of 4.0kg•m/s hits wall and bounces back w/o losing kinetic energy. What is the change in momentum?
0.0kg•m/s
-8.0kg•m/s
19
scalar or vector: the speed of a snail, the time it takes to run a mile, the free-fall acceleration.
Vector, scalar, scalar
Scalar, scalar, vector
20
When a car’s velocity is positive and its acceleration is negative, what is happening to the car’s motion?
The car speeds up
The car slows down
21
If you want to open a swinging door with the least amount of force, where should you push on the door?
Close to the hinges
Far from the hinges
22
If a nonzero net force is acting on an object, then the object is definitely
Accelerating
At rest
23
Which of the following equations best describes the graph above?
y =x^2 - 1
y=-x^2 +1
24
When an object is moving with uniform circular motion, the object’s tangential speed
is directed toward the center of motion.
Is constant
25
The statement by Newton that for every action there is an equal but opposite reaction is which of his laws of motion?
First
Third
26
Which of the following line segments on a position versus time graph is physically impossible?
A vertical line
A straight line that slopes to the left
27
When a car’s velocity is negative and its acceleration is negative, what is happening to the car’s motion?
The car speeds up
The car slows down
28
Which of the following is the tendency of an object to maintain its state of motion?
Velocity
Inertia
29
you lift an apple from the ground to some point above the ground, the gravitational potential energy is stored
In both the apple and the earth
The gravitational field between the apple and earth
30
The degree to which an object attracts other objects is measured by the object’s
Gravitational mass
Weight
31
The length of a force vector represents the
Magnitude of the force
Type of force
32
How would the speed of Earth’s orbit around the sun change if Earth’s distance from the sun increased by 4 times?
It would decrease by a factor of 2
It would increase by a factor of 2
33
Which of the following equations can be used to directly calculate an object’s momentum, p?
P=mv
Delta p= F Delta t
34
The centripetal force on an object in circular motion is
in the same direction as the centripetal acceleration.
in the direction opposite the tangential speed
35
What quantity measures the work done by a machine relative to the work done on a machine?
Torque
Efficiency
36
According to the graph above, during which interval is the cat at rest?
5.0-10.0
15.0-20.0
37
Which of the following is the equation for average velocity?
Vavg=Delta x/ Delta t
Vavg= Delta t/Delta x
38
A ball is dropped from a person’s hand and falls to Earth. Identify an action-reaction pair in this situation.
Earth exerts force on ball; hand exerts force on Earth
Earth exerts force on ball; ball exerts force on Earth
39
net force of 6.8N accelerates a 31kg scooter across a parking lot. What is the magnitude of the scooter’s acceleration
0.22m/s^2
4.6 m/s^2
40
A ball is whirled on a string, then the string breaks. What causes the ball to move off in a straight line?
Inertia
Centripetal acceleration
41
A sled weighing 1.0 × 10? N is held in place on a frictionless 20.0° slope by a rope attached to a stake at the top.
34N
94N
42
The centripetal force on an object in circular motion is
object’s motion and perpendicular to the tangential speed.
object’s motion and in the same direction as the tangential speed.
43
rubber ball moving at a speed of 5 m/s hit a flat wall and returned to the thrower at 5 m/s. Magnitude and momentum
Remained the same
Was not conserved
44
At what point of the ball’s path shown in the figure above is the vertical component of the ball’s velocity zero?
D
B
45
Multiplying or dividing vectors by scalars results in
Vectors of multiplied or scalars of divided
Vectors
46
Which of the following does not exhibit parabolic motion?
A frog jumping from land to water
A flat piece of paper released from a window
47
In which of the following sentences is work used in the scientific sense of the word?
Holding a heavy box requires a lot of work.
Sam and Rachel pushed hard, but they could do no work on the car.
48
best coordinate system to analyze a painter climbing a ladder at an angle of 60° to the ground?
x-axis: horizontal along the ground; y-axis: up and down
x-axis: horizontal along the ground; y-axis: along the ladder
49
Which of the following is a coordinate system for specifying the precise location of objects in space?
Y-axis
Frame of reference
50
The impulse experienced by a body is equivalent to the body’s change in
Momentum
Velocity
51
Which would hit the ground first if dropped from the same height in a vacuum—a feather or a metal bolt?
They would hit the ground at the same time
The metal bolt
52
A more powerful motor can do
More work over a longer time interval
The same work in a shorter time interval
53
In the figure above, the horizontal component of the ball’s velocity at A is
equal to the vertical component of the ball’s velocity at C.
equal to the horizontal component of its initial velocity.
54
Why does an astronaut weigh less on the moon than on Earth?
gravitational field strength is less on the moon’s surface
The astronaut is continually in free fall because the moon orbits Earth.
55
When an object is moving with uniform circular motion, the centripetal acceleration of the object
Is zero
Is directed toward the center of motion
56
A sledtraveling at a speed of3.0m/s slows to a stop4.0m from thepoint where its passenger rolled off…magnitude net force
13N
34N
57
What is the path of a projectile (in the absence of friction)?
Projectiles do not follow a predictable path
Parabola
58
Where should a force be applied on a lever arm to produce the most torque?
Farthest from the axis of rotation
closest to the axis of rotation
59
What are the units for a spring constant?
N/m
N•m
60
An object’s tendency to resist acceleration is measured by the object’s
Gravitational mass
Inertial mass
61
A 75kg person bumps into an 80kg person. The momentum of the 80kg person
Decreases
Increases
62
A newton is equivalent to which of the following quantities?
Kg•m/s
Kg
63
100.0 km is measured at various speeds. From the graph above, what speed will allow the trip to be made in 2 hours?
50.0 km/h
40 km/h
