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Worksheetsphysics: Final Test
Total questions: 92
Worksheet time: 23hrs 46mins
A dog walker is walking 2 dogs, Spot & Stripe. Each dog is on its own leash. Spot pulls his leash North with a force of 3 Newtons. Stripe pulls her leash East with a force of 4 Newtons. What force does the dog walker feel?
1 Newton
7 Newtons
5 Newtons
Cannot be determined without knowing the breed of the dogs.
An airplane, flying at an altitude of 5 miles, is on a flight path that passes directly over an observer. Find the distance d from the observer to the plane when the angle of elevation from the observer to the plane is 46 degrees. Answer in units of miles in the following format x.xx
3.60 m
4.83 m
6.95 m
7.20 m
A light post, shown below, is set in concrete and supported with a guy wire while the concrete dries. The length of the guy wire is 10 feet and the ground stake is 4 feet from the bottom of the light post. Which equation could be used to find the height of the light post, x, from the ground to the top of the light post?
X = √(102 + 42)
X = 102 + 42
X = √(102 - 42)
X = 102 - 42
Vector A is on the positive y-axis. Vector B is on the negative y-axis. Vector C is on the positive x-axis. The resultant vector from adding all three together might lie in which quadrant(s)?
Quadrant III
Quadrant I
Quadrant IV
Quadrant II
Consider two vectors, A and B, with magnitude 30 Newtons and 50 Newtons, respectively. The vectors may be arranged such that the magnitude of the resultant could be any of the following EXCEPT
30 N, 50 N, and 70 N
40 N, 60 N, and 80 N
10 N, 20 N, and 30 N
30 N, 40 N, and 50 N
Consider the following two vectors, A and B. Which of the following best represents A+B?
Which of the following are vectors?
speed and distance
displacement and distance
acceleration and speed
displacement and velocity
A force vector is directed along the positive x-axis. Another force vector is directed along the negative y-axis. The resultant vector might lie in which quadrant(s)?
Quadrant III
Quadrant IV
Quadrant I
Quadrant II
Consider the triangle below. Which one of the following statements is true?
Two vectors A and B have different magnitudes and make an angle of 90 degree with each other. The magnitude of the resultant vector R=A+B is
Smaller than A and smaller than B.
Larger than one vector but smaller than the other.
Larger than A and larger than B.
There is not enough information to determine the magnitude of the resultant vector.
Find the angle of elevation if you are standing 400 ft. away and the building is 850 ft. tall?
64.8 degree
25.2 degree
28.1 degree
61.9 degree
Consider the following two vectors, A and B. Which of the following best represents A+B?
The diagram here represents a light ray being reflected from a plane mirror. From the data given in the diagram, what is the angle of reflection?
40
100
10
50
Which wave phenomenon is illustrated by the diagram below?
Reflection
Doppler Effect
Diffraction
Refraction
A particular sound wave in water has a frequency of 2140 Hz and a wavelength of 1.7 m. What is the velocity of this wave in water?
125.9 m/s
363.0 m/s
3638 m/s
1259 m/s
Unit for measuring period.
period
amplitude
seconds
frequency
hertz
Unit for measuring frequency.
seconds
frequency
amplitude
period
hertz
Figure below is a "snapshot" of a wave at a given time. The frequency of the wave is 120 Hz. What is the wavelength?
0.3 m
0.2 m
0.1 m
0.05 m
Refraction occurs because the new medium changes the wave’s ________.
frequency and amplitude
speed
amplitude
frequency
Light rays moving from medium 1 to medium 2 are bent toward the normal. Which of the following statements is true?
Medium 1 is more dense than medium 2.
We cannot determine anything about the density of the mediums from this
Both media have equal densities
Medium 1 is less dense than medium 2.
The structure labeled “C” in the figure is the
trough
amplitude.
wavelength
crest.
The material through which a mechanical wave needs to travel is called the ___________.
frequency
medium
wavelength
amplitude
Two pulses are traveling along a string toward each other as represented in the diagram shown. Which phenomenon will occur as the pulses meet?
destructive interference
reflection
diffraction
constructive interference
Electromagnetic waves ________.
would not travel well in air
do not need a medium to travel
need a medium to travel
cannot travel through space like sound can
The Empire State Building in New York sways back and forth with a frequency of about 0.15 Hz. What is its period of vibration?
15 s
6.67 s
0.15 s
16.7 s
A periodic wave travels through a rope, as shown in the diagram. As the wave travels, what is transferred between points A and B ?
mass only
energy only
both mass and energy
neither mass nor energy
Which wave phenomenon is illustrated by the diagram below?
refraction
interference
diffraction
reflection
The number of waves that pass a certain point each second.
period
hertz
seconds
amplitude
frequency
Half the distance from the top of a crest to the bottom of a trough.
period
amplitude
hertz
frequency
seconds
The time it takes for one complete vibration.
amplitude
frequency
hertz
period
seconds
The shortest distance between two identical points on a wave is the ____.
frequency
period
wavelength
amplitude
Calculate the index of refraction for the second medium.
1.65
2.12
1.17
1.28
If an object with a velocity of 50 m/s has the same momentum as that of a 10 kg mass having a velocity of 20 m/s, the mass of the object is _______.
10 kg
less than 10 kg
greater than 10 kg
Answer the following question.
The momentum of the red cart is equal and opposite to the momentum of the blue cart
Neither red cart nor blue cart have a momentum change.
The momentum of the red cart and the blue cart does not change
The momentum change of the red cart is equal and opposite to the momentum change of the blue cart.
The momentum of the red cart is equal to the momentum of the blue cart.
Two objects, A and B, have the same size and shape. Object A is twice as massive as B. The objects are simultaneously dropped from a high window on a tall building. (Neglect the effect air resistance.) The objects will reach the ground at the same time but object A will have a greater ___.
speed
acceleration
momentum
displacement
Which of the following statements is NOT true about inelastic collisions?
Objects in such collisions get stuck together.
Objects in such collisions bounce off each other.
Some of the kinetic energy is lost as heat as a result of the collision.
Objects in such collisions become deformed if they do not stick together.
When a golfer hits a golf ball, the force exerted by the ball on the club is ______ that exerted by the club on the ball.
less than
greater than
equal to
Cars are equipped with padded dashboards. In collisions, the padded dashboards would be safer than non-padded ones because they ____.
increase the impact time
increase the impact force
increase an occupant's impulse
increase change in momentum
The greatest change in momentum will be produced by __________.
a large force acting over a long time
a small force acting over a long time
a large force acting over a short time
a small force acting over a short time
When a golf club hits a golf ball, the change in momentum of the ball is _______ the change in momentum of the club.
equal to
less than
greater than
Identify the collision parameters that are consistent with the change in momentum indicated in the diagram below.
Impulse = +0.67 N x s
F = +4 N, t = 1.5 s
F = +12 N, t = 2s
Impulse = +20 kg x m/s
A wad of chewed bubble gum is moving with 1 unit of momentum when it collides with a heavy box that is initially at rest. The gum sticks to the box and both are set in motion with a combined momentum that is ___.
not enough information
less than 1 unit
more than 1 unit
1 unit
A 100 kg roller coaster train approaches the loading dock at speed of 20.0 m/s. It is abruptly decelerated to a speed of 10 m/s over a distance of 15.0 m. Determine the retarding force that acts upon the roller coaster cars. (SHOW YOUR WORK on the scratch paper.)
-1000 N
-15000 N
-1500 N
-333.3 N
An object with a mass of 15 kg is launched straight upward with an initial velocity of 20 meters/second. What is object's maximum height? (SHOW YOUR WORK on the scratch paper.)
300 m
30 m
200 m
20 m
A man with a mass of 90.0 kg runs up a flight of stairs to a height of 7.5 m in a time of 18.5 seconds. With what power did the man climb the stairs?
12487.5 W
364.9 W
36.5 W
6750 W
Calculate the potential energy of a woman with a mass of 55.0 kg who is standing on a balcony that is 15 m off of the ground?
6187.5 J
8250 J
825 J
3.7 J
The quantity Fd/t is
the potential energy of the object.
the work done on the object by the force.
the power supplied to the object by the force.
the kinetic energy of the object.
In which of the following situations is no work done on a football?
carrying it
throwing it
kicking it
picking it up
When a force is exerted on a object, work is done only if the object ______.
remains stationary
moves
has no momentum
is heavy
At which positions is the total mechanical energy of the roller coaster in the image to the left the same?
they are all equal
a and c only
a and b only
b and d only
If the net work done on an object is zero, then the object's kinetic energy
remains the same.
is zero.
decreases.
increases.
A box is being pulled across the carpeted floor of a room by a rope. There are four force vectors acting on the box—Gravity, Normal, Tension, and Friction. The box is moving at a constant velocity. The work done by Friction is
Zero
None of these
Negative
Positive
A dog running at a speed of 12 m/s has 1,080 J of kinetic energy. What is the mass of the dog?
7.5 kg
30 kg
45 kg
15 kg
At the top of its arc, a thrown ball has _____ potential energy.
zero
average
maximum
minimum
A box is being pulled across the carpeted floor of a room by a rope. There are four force vectors acting on the box—Gravity, Normal, Tension, and Friction. The box is moving at a constant velocity. The work done by Rope (tension force) is
None of these
Negative
Zero
Positive
The rate at which work is done is called _______.
potential energy
kinetic energy
power
work
A box is being pulled across the carpeted floor of a room by a rope. There are four force vectors acting on the box—Gravity, Normal, Tension, and Friction. The box is moving at a constant velocity. The work done by Normal force is
Negative
Zero
Positive
None of these
Which of the following processes requires the most work?
A 10 kg weight rests on a table.
A person holds a 1 kg weight still with outstretched arms
A person lifts a 1 kg weight 1 m off the floor
A 10 kg ball is rolled across the floor at a constant speed for a distance of 10 m.
A force moves an object in the direction of the force. The graph below shows the force versus the object's position. Find the work done when the object moves from 2.0 to 4.0 m.
60 J
80 J
20 J
40 J
An acorn falls from a tree. Compare its kinetic energy K, to its potential energy U.
K increases and U increases.
K increases and U decreases.
K decreases and U increases.
K decreases and U decreases
An apple is falling from a tree branch. The total energy of the apple ___________.
remains constant
cannot be accurately measured
is constantly increasing
is constantly decreasing
The gravitational potential energy of an object close to Earth is directly related to ____.
the mass of the object
both mass and height of the object
the height of the objectthe height of the object
the velocity of the object
A pendulum swings back and forth and has a kinetic energy of 400 J at a particular point in its path. Which of the following statements is not true?
Both the kinetic and potential energy are decreasing.
When the kinetic energy is zero, the potential energy will be 400 J greater.
The potential energy increases when the kinetic energy decreases.
The minimum kinetic energy is zero.
Three identical balls approach three different "frictionless" hills with a speed of 2 m/s. In which case will the ball roll the highest?
c
a
all cases the same
b
As a dropped penny falls toward the ground, _____ energy is converted to _____ energy.
potential, kinetic
thermal, potential
kinetic, heat
kinetic, vibrational
If you push twice as hard against a stationary brick wall, the amount of work you do
is cut in half.
remains constant at zero.
doubles.
remains constant but non-zero.
When you throw a ball up into the air, the total energy of the ball at any point in its flight can be expressed as kinetic energy ______ potential energy.
divided by
plus
minus
times
Describe the energy of a car driving up a hill.
both kinetic and potential
entirely potential
entirely kinetic
gravitational
A change in kinetic energy of an object is equal to the __________.
change in its mass
net work done on the object
velocity of the object
force exerted on an object
How much does the kinetic energy of an object change if its velocity is doubled?
¼ KE
4 KE
½ KE
2 KE
An astronaut with a mass of 91 kg is 0.30 m above the moon’s surface. The astronaut’s potential energy is 46 J. Calculate the free-fall acceleration on the moon.
0.15 m/s2
6.6 m/s2
1.7 m/s2
9.8 m/s2
The amount of work required to stop a moving object is equal to the
mechanical energy of the object.
potential energy of the object.
velocity of the object.
kinetic energy of the object
Which of the following does the force of friction NOT depend?
the normal force pressing the two surfaces together
the nature of the two surfaces in contact
the surface area of the two surfaces in contact
smoothness of the two surfaces
What is the weight of an object with a mass of 7 kg that is located on the moon, whose acceleration due to gravity is 1.67 m/s2?
11.69 N
11.69 m/s2
0.24 N
4.19 N
If you push against a wall, the wall pushes back against you with ______ force.
more
less
equal
no
Which of the following will result in the greatest acceleration?
56 N acting on a 1-kg box
56 N acting on a 2-kg box
23 N acting on a 5-kg box
23 N acting on a 2-kg box
Static friction is always ______ sliding friction.
less than
equal to
greater than
A 50 kg child on a skateboard experiences a 75 N force as shown below. What is the expected acceleration of the child?
0.67m/s2
25.00 m/s2
6.70 m/s2
1.50 m/s2
Four forces act on an object as shown. The forces are not drawn to scale. The object is accelerating to the right. Compare the forces.
F1 > F2, F3 < F4
F1 > F2, F3 = F4
F1 = F2, F3 > F4
F1 = F2, F3 < F4
According to Newton’s ______ Law, an object with no net force acting on it remains at rest or in motion with a constant velocity.
third
second
first
The moon has a smaller mass than the Earth. If you were able to travel to the moon your weight would...
stay the same
vary with day and night
decrease
increase
Which type of friction opposes the start of motion?
sliding
coefficient
static
Two teams in a tug of war exert the same amount of force on each other and the rope does not move. Newton’s _____ law explains why the rope does not move.
first
seccond
third
If a wheelbarrow is being pushed with a constant net force and the mass was doubled, the acceleration would
increase
stays the same
decrease
Newton’s ______ law states that the acceleration of a body is directly proportional to the net force on it and inversely proportional to its mass.
first
third
second
Which statement about weight is incorrect?
An object weighs more on the moon than it weighs on Earth.
An object’s weight is directly proportional to its mass.
The weight of an object depends on gravity.
A change in an object’s location can change the object’s weight
A 10 kg box is sliding south across a floor with a coefficient of friction of 0.6. What is the friction force between floor and the box?
60 N
6 N
16.7 N
166.7 N
What is the mass of an object that weighs 250 N on the surface of the Earth where the acceleration due to gravity is 9.80 m/s2?
24.5 kg
25.5 kg
255 kg
2,450 kg
In order to slide a heavy desk across the floor at constant speed in a straight line, you have to exert a horizontal force of 700 Newtons. Compare the 700-Newton horizontal pushing force F to the frictional force f between the desk and the ground.
F < f; the frictional force is greater than the pushing force since it is such a heavy desk.
F = f from Newton’s first law.
F > f; the frictional force is always less than any other force acting on the object
F = f from Newton’s third law.
An upward force of 150 N is applied to a box weighing 70 N. Which of the below is the free-body force diagram for this situation?
D
A
B
C
Which of these factors does NOT affect friction?
the surface area of the two surfaces in contact
how hard the two surfaces press together
the texture of the two surfaces in contact
the nature of the two surfaces in contact
A 0.50-kilogram puck sliding on a horizontal shuffleboard court is slowed to rest by a frictional force of 1.2 N. What is the coefficient of kinetic friction between the puck and the surface of the shuffleboard court?
0.42
4.1
0.24
0.6
