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Honors Physics_Unit 6 Review

Total questions: 152

Worksheet time: 8hrs 18mins

Name
Class
Date
1.
The momentum of an object depends upon the object's ___________&_____________.  
a)
size and shape
b)
mass and speed
c)
mass and veloctiy
d)
mass and energy
2.
The equation to calculate momentum is
a)
p=mv
b)
p=1/2mv2
c)
p=mgh
d)
p=mg
3.
Which has more momentum: a car stopped at a red light or a bike moving at 15 mph?
a)
car
b)
bike
c)
they are equal
d)
cannot determine using the info provided
4.
Determine the momentum of 1000-kg car moving southward at 20 m/s......... 
a)
20000 N
b)
20000 Joules
c)
20000 Kg * m/s south
d)
10000 kg * m/s south
5.
A 2.5 kg ball moving at 5 m/s collides with a 2.5 kg stationary ball in a perfectly elastic collision.  What is the velocity of the second ball after the collision? 
a)
5 m/s
b)
2.5 m/s
c)
10 m/s
d)
7.5 m/s
6.
A 9300 kg railroad car traveling at a velocity of 5 m/s strikes a second boxcar that weighs 5000 kg at rest. At what speed will the second boxcar move?
a)
18.6 m/s
b)
9.3 m/s
c)
7.5 m/s
d)
1.86 m/s
7.
Momentum is a ____________________ quantity
a)
science
b)
scalar
c)
vector
d)
energy
8.
A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.
Calculate the impulse on the ball.
a)
1 N*s
b)
6 N*s
c)
33.3 N*s 
d)
None of these
9.
The impulse is ______ the change in momentum
a)
Greater than
b)
Equal to
c)
less than
d)
always double
10.
In any collision (crash) the ______ is ALWAYS constant
a)
Total Momentum
b)
total speed
c)
total Velocity
d)
Energy
11.
When two objects collide, the Pbefore is ____________ the Pafter.
a)
more than 
b)
less than 
c)
equal to
d)
unrelated to
12.
When the speed of an object is doubled, its momentum
a)
remains unchanged in accord with the conservation of momentum.
b)
doubles
c)
quadruples
d)
decreases
13.
Which object listed below has the greatest momentum?
a)
A 0.05 kg object rolling at 0.2 m/s.
b)
A 0.15 kg object rolling at 2 m/s.
c)
A 0.15 kg object rolling at 1 m/s
d)
A 0.4 kg object rolling at 2 m/s.
14.
Which of the following has the least amount of momentum?
a)
An ant walking along the ground
b)
An ant at rest
c)
An elephant walking
d)
An elephant running
15.
What is the unit for momentum?
a)
m/sec
b)
kg/sec
c)
kg/m
d)
kg m/sec
16.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
17.
Determine the momentum of 1000-kg car moving northward at 20 m/s......... 
a)
20000 N
b)
20000 Joules
c)
20000 Kg * m/s
d)
20000 kg * m/s north
18.
Most modern vehicles have padded dashboards. This reduces collision injuries by...
a)
reducing the driver's change in momentum
b)
increasing the driver's change in momentum
c)
increasing the force of impact
d)
increasing the time of impact
19.

In an elastic collision, ______ is conserved.

a)

Momentum only

b)

Kinetic Energy only

c)

Both momentum and energy

20.
In a perfectly inelastic collision, ______ is conserved. 
a)
Momentum only
b)
Kinetic Energy only
c)
Both momentum and kinetic energy
21.
Which of the following collisions is not perfectly elastic nor perfectly inelastic?
a)
a football tackle where both players fall wrapped together
b)
a cue ball hitting a billiards ball
c)
a flower pot breaking over someone's head
d)
an arrow staying in the apple after impact
22.
A 50 kg ball rolls down the street at 5 m/s. Calculate the momentum of the ball. 
a)
55 kg*m/s
b)
100 kg*m/s
c)
250 kg*m/s
d)
500 kg*m/s
23.

Two skaters begin at rest. Skater 1 has a smaller mass than Skater 2. After they push off each other,...

a)

Skater 1 experiences a greater change in momentum

b)

Skater 2 experiences a greater change in momentum

c)

Skater 1 has a greater speed than Skater 2

d)

Skater 1 experiences a greater force

24.
What happens to the speed of the wagon as the rain collects inside of it?
a)
it decreases
b)
it remains constant
c)
it increases
25.
A block sliding on a frictionless surface runs into a second block of equal mass at rest. After the two collide, they stick together and travel with a velocity...
a)
that is twice the magnitude of the original velocity
b)
that is half the magnitude of the original velocity
c)
more information is needed
26.
Two blocks begin at rest with an initial momentum of zero. After the spring is sprung, the two blocks move in opposite directions. What is the total final momentum? 
a)
zero
b)
a positive value in the direction of the heavier block
c)
a positive value in the direction of the faster block
d)
more information is needed
27.
Parkour Peter bends his knees upon landing in order to ____
a)
reduce his change in momentum
b)
increase his change in momentum
c)
increasing his landing time
d)
increasing his landing force
28.
Both students experience the same ____
a)
force of impact
b)
time of impact
c)
change in momentum
d)
all of the above
29.

A block of mass M slides across a frictionless surface with velocity v until collides with a stationary block of mass m. If the two blocks stick together, what is their velocity after the collision?

a)

(M+m)v / m

b)

(M-m)v

c)

Mv / (M+m)

d)

(M-m)v / M

30.

A 5 N force is applied to a 3 kg ball to change its velocity from +9 m/s to +3 m/s. The impulse on the ball is ______ N s.

a)

-2.5

b)

-10

c)

-18

d)

-45

31.
A 0.250 kg cart moving at 0.400 m/s has how much momentum?
a)
0.1 kg-m/s
b)
1 kg-m/s
c)
10 kg-m/s
d)
100 kg-m/s
32.
Softer landings tend to
a)
increase impact force
b)
increase force
c)
increase collision time
d)
increase change in momentum
33.
Softer landings tend to
a)
increase impact force
b)
increase force
c)
increase collision time
d)
increase change in momentum
34.
A runner has a momentum of 670 kg m/s and is travelling at a velocity of 9 m/s. What is his mass?
a)
6030 kg
b)
0.0134 kg
c)
74.4 kg
d)
80 kg
35.
The units for Impulse are
a)
N/s
b)
N.s
c)
N
d)
m/s
36.
Cart A is pulled with a 2 Newton force for 2 seconds, and Cart B is pulled with a 1 Newton force for 3 seconds.  Which cart experiences the greatest impulse?
a)
Cart B
b)
Cart A
c)
they are the same
37.
A boy kicks a football with a force of 20 N, the time the force acts for is 0.3 s.
Calculate the impulse on the ball.
a)
1 N.s
b)
6 N.s
c)
66 N.s 
d)
None of these
38.
The purpose of crumble zones on a car is to
a)
decrease time of impact.
b)
increase force of impact.
c)
increase the time of impact.
d)
decrease the impulse during impact.
39.

In an isolated system, the net ____ on that system is zero.

a)

external force

b)

internal force

c)

time interval

d)

displacement

40.
The impulse-momentum theorem states that
a)
the impulse on an object is equal to the change in momentum it causes 
b)
the force on a moving object is equal to the magnitude of the impulse.
c)
the impulse on an object is greater than the change in momentum it causes 
d)
the impulse on an object is less than the change in momentum it causes
41.
A constant force of 4.5 N acts on a 7.2-kg object for 10.0 s. What is the     change in the object's velocity? 
a)
6.3 m/s
b)
3.2 m/s
c)
1.2 m/s 
d)
4.33 m/s
42.
If an air bag changes a 60 kg person's speed from 40.0 m/s to     0.0 m/s, what impulse must act on the person? 
a)
 2400 kg.m/s
b)
1.5 kg.m/s
c)
0.67 kg.m/s
d)
1500 kg.m/s
43.
The velocity of a 975-kg car is changed from 12.0 m/s to 27.0 m/s in 15s by an external, constant force. What is the magnitude of the force? 
a)
9.75×102 N
b)
1.46×104 N
c)
9.75×103 N
d)
975 kg·m/s
44.
A force acted upon an object for 3 s as shown in the graph below.
 What is the magnitude of the impulse on the object?
a)
3
b)
4.5
c)
6
d)
9
45.
what is the objects momentum for 8 m/s
a)
6
b)
8
c)
10
d)
12
46.
what is the object's velocity for momentum of 6 kg.m/s?
a)
2
b)
4
c)
6
d)
8
47.

can a bullet have the same momentum as a truck?

a)

yes

b)

no

48.
Sally runs and jumps off of a diving board and lands on a tube (she stays in the tube).  The collision between Sally and the tube is
a)
Elastic
b)
Inelastic
c)
Perfectly Inelastic
d)
Completely absurd
49.
Two objects of the same mass collide with each other.  The second object is at rest and the first is moving at 5 m/s North before the collision.  After the collision, the first mass is at rest and the second mass continues at 5 m/s North. 
The type of collision represented by these two masses is
a)
Inelastic
b)
Completely Inelastic
c)
Elastic
50.
Bob is moving at a velocity of 3 m/s South when he jumps into a sled that is at rest. The quantities that are conserved during this collision include:
a)
Kinetic Energy only
b)
Momentum only
c)
Momentum and kinetic energy
51.
Rahim observed a collision in lab where the kinetic energy after the collision was equal to the kinetic energy before the collision.  This type of collision is
a)
Completely Inelastic
b)
Elastic
c)
Inelastic
52.
Shaniqua noticed a collision outside the coffee shop where two cars collided and stuck together.  What type of collision did she observe?
a)
Elastic
b)
Inelastic
c)
Completely inelastic
53.
This picture is an example of ____________
a)
Elastic Collision
b)
Inelastic collision
54.
The law of conservation of momentum states that the total momentum of all objects interacting with each other will  ________________________ no matter of the nature of the forces between the object.
a)
increase
b)
decrease
c)
remain constant
d)
fluctuate
55.
What is Newton's Law of Conservation of Momentum?
a)
Object in motion stays in motion and an object at rest stays at rest unless acted on by a outside force
b)
Force = mass x acceleration
c)
For every action there is an equal and opposite reaction
d)
Momentum can not be created or destroyed without outside forces
56.
The momentum of an object depends upon the object's ___________&_____________.  
a)
size and shape
b)
mass and veloctiy
c)
mass and energy
57.

kinetic energy is conserved in what type of collision?

a)

elastic

b)

inelastic

c)

both elastic and inelastic

d)

neither elastic or inelastic

58.

What are the units for momentum

a)

kg*m/s

b)

kg

c)

m/s

d)

none of these

59.

In order for an object to have momentum it must be ________

a)

moving

b)

motionless

c)

alive

d)

asleep

60.
The total momentum before a collision is _________ the total momentum after a collision.
a)
equal to 
b)
less than 
c)
more than
d)
It depends on the type of collision
61.
Energy of a rock perched on a cliff is an example of...
a)
gravitational
b)
elastic
c)
chemical
d)
kinetic
62.
Energy from a compressed spring would be an example of...
a)
kinetic
b)
elastic
c)
gravitational
d)
chemical
63.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
64.
How do we calculate work?
a)
W = F * d
b)
w = f * D
c)
W = F * D
d)
w = f * d
65.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
66.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
67.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
68.
The energy of movement is...? 
a)
Kinetic
b)
Potential
69.
Energy that is stored is called...
a)
Kinetic
b)
Potential 
70.
The SI unit for power is...?
a)
Watts
b)
Joules
c)
Newtons
d)
Meters
71.
What is the formula for Kinetic Energy?
a)
PE = m*g*h
b)
KE = 1/2m*v2
c)
W = F*d
d)
P = W/t
72.
A force exerted over a distance to move an object is ______________________.
a)
power
b)
work
c)
momentum
d)
Watt
73.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
74.
If 68 Joules were necessary to move a 4 Newton crate, how far was the crate moved?
a)
272 m
b)
17 m
c)
4.05 m
d)
272 cm 
75.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
76.
Gravitational potential energy depends on the ________ and ________ of the object. 
a)
Height and mass
b)
Friction and movement
c)
Mass and Movement
d)
Height and Friction 
77.
When you release a stretched rubber band, the rubber band has ________ energy. 
a)
kinetic 
b)
potential
c)
none of the above
d)
all of the above 
78.
Elastic potential energy is energy stored in object that are compressed or __________. 
a)
movement
b)
stored
c)
harnessed
d)
pulled 
79.
What is the formula for calculating the total amount of mechanical energy?
a)
ME = KE + PE
b)
KE = ME + PE
c)
PE = KE + ME
d)
ME = 1/2 mv2
80.
Why does the total amount of mechanical energy stay constant in a system?
a)
energy is not created or destroyed
b)
energy leaves
c)
energy enters
d)
energy is not converted from one form into another
81.
What is the energy of position or shape that depends on weight and height, also called stored energy?
a)
Energy
b)
Kinetic energy
c)
Potential energy
d)
Sound energy
82.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
83.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
84.

A force acting on an object does no work if

a)

a machine is used to move the object.

b)

the force does not cause the object to move.

c)

the force is greater than the force of friction.

d)

the object accelerates.

85.

An object has 12.4 J of potential energy and 23.5 J of kinetic energy. What is the mechanical energy of the system?

a)

11.1 J

b)

1.895 J

c)

35.9 J

d)

291.4 J

86.

What is the kinetic energy of an 9 kg bowling ball rolling at 3.30 m/s?

a)

29.7 J

b)

323.4 J

c)

49.005 J

d)

14.85 J

87.

An 80 kg skier stands at the top of a 40 meter slope. What is her gravitational potential energy before she skies down the slope?

a)

3200 J

b)

31,360 J

c)

15,680 J

d)

19.6 J

88.

If you hold a 20 N object 2 m off of the ground, how much work have you done?

a)

40 J of Work

b)

10 J of Work

c)

No Work

d)

18 J of Work

89.

If you drive your 1,000 kg car from sea level up to the Nu'uanu Pali lookout, which is 366 m above sea level, how much will you have increased your car's gravitational potential energy?

a)

3,000,000 J

b)

366,000 J

c)

3,586,800 J

d)

586,800 J

90.

What is the kinetic energy of a 4 kg rock falling through the air at 5 m/s?

a)

10 J

b)

50 J

c)

20 J

d)

200 J

91.

If a rock falls from a cliff, at what point are its kinetic energy and its potential energy the same? Ignore air resistance.

a)

Just as it starts to fall

b)

just before it hits the bottom

c)

halfway down

d)

never

92.

If two rocks are launched through the air at the same speed, but one has twice as much mass as the other, how do their kinetic energies compare?

a)

The kinetic energy of the two rocks is the same because they have the same speed

b)

The rock with the greater mass will only move a small distance and then fall straight to the ground

c)

The two rock could not have the same speed if they have different masses

d)

The rock with the greater mass has more kinetic energy than the rock with less mass even though they are traveling at the same speeds because both mass and speed affect kinetic energy.

93.

You’re watching a volleyball game and someone asks you what type of energy best describe the movement of the volleyball players. Which of the following choices should your answer be in order to be correct?

a)

Chemical

b)

Sound

c)

Mechanical

d)

Potential

94.

Where would a car traveling on a roller coaster track have the most potential energy?

a)

At the bottom

b)

Halfway to the top

c)

at the top

d)

halfway to the bottom

e)

It is always the same

95.

What would happen to the kinetic energy of an object if you doubled the mass?

a)

The kinetic energy would be cut in half

b)

The kinetic energy would double

c)

The kinetic energy would triple

d)

It would stay the same because mass does not effect kinetic energy

96.

If a 2 kg ball is traveling at 4 meters per second, what is its kinetic energy?

a)

1 J

b)

2 J

c)

4 J

d)

8 J

e)

16 J

97.

Which point has the most kinetic energy?

a)

Ball G

b)

Ball F

c)

Ball E

d)

Ball D

e)

Ball A

98.

As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy?

a)

Both the potential energy and kinetic energy decrease

b)

The potential energy decreases while the kinetic energy increases

c)

The kinetic energy decreases while the potential energy increases

d)

Both the potential energy and kinetic energy increase

99.

For work to be done on an object,

a)

some force need only be exerted on the object.

b)

the object must move some distance as a result of a force.

c)

the object must move, whether or not a force is exerted on it.

d)

the object must not move.

100.

A 35 kg chair is lifted 5 m off the ground. What is its potential energy?

a)

175 J

b)

30 J

c)

1715 J

d)

40 J

101.

What is the kinetic energy of a 1-kilogram ball is thrown into the air with an initial velocity of 30 m/sec?

a)

30 J

b)

450 J

c)

900 J

d)

29 J

102.

What is the potential energy of a 3 kilogram-ball that is on the ground?

a)

9.8 J

b)

3 J

c)

1 J

d)

0 J

103.

A 75kg refrigerator is located on the 70th floor of a skyscraper (300 Meters above the ground). What is it's potential energy?

a)

220,500 J

b)

225,000 J

c)

375 J

d)

39.2 J

104.

If Ronnie is driving a truck with a velocity of 40m/s and the truck has a mass of 1120kg then the truck has __________ energy in the amount of _________.

a)

POTENTIAL ENERGY in the amount of 439,040 J

b)

POTENTIAL ENERGY in the amount of 896,000 J

c)

KINETIC ENERGY in the amount of 439,040 J

d)

KINETIC ENERGY in the amount of 896,000 J

105.

There is a bell at the top of a tower that is 45 m high. The bell weighs 19 kg. When the bell is ringing it has 38 J of kinetic energy. What is the mechanical energy of the bell?

a)

8379 J

b)

8417 J

c)

32,490 J

d)

102 J

106.

A 5 kg object is moving downward at a speed of 12 m/s. If it is currently 2.6 m above the ground then what is the mechanical energy of the object?

a)

360 J

b)

487.4 J

c)

127.4 J

d)

156 J

107.

A grape fruit has 1568 J of potential energy at the top of a tree, but when the grape fruit falls it has 16 J of kinetic energy. What is the mechanical energy of the grape fruit?

a)

0 J

b)

1584 J

c)

25,088 J

d)

98 J

108.
When a pendulum swings, at which point is potential energy at its greatest
a)
1
b)
2
c)
3
d)
4
109.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
110.
As a pendulum swings from its highest to lowest position, what happens to its kinetic and potential energy? 
a)
Both the potential energy and kinetic energy decrease
b)
The potential energy decreases while the kinetic energy increases 
c)
The kinetic energy decreases while the potential energy increases 
d)
Bothe the potential energy and kinetic energy increase 
111.
Find the distance an object traveled if a force of 350 N acted on it to produce 0 work?
a)
3 m
b)
2 m
c)
1 m
d)
0 m
112.
An Xbox consumes 15.7 watts while in standby mode. If you leave it in standby mode for 86,400 seconds (one day), how much work was done?
a)
1,356,490 J
b)
1,356,480 J
c)
1,356,470 J
d)
1,356,460 J
113.
How far does a car that weighs 5,000 N go if 18,000 J of work is done on it?
a)
3.8 m
b)
3.7 m
c)
3.2 m
d)
3.6 m
114.
A person weighing 600 N gets on an elevator. The elevator lifts the person 6 m in 10 seconds.  How much power was used?
a)
360 W 
b)
60 W
c)
3600 W
d)
600 W
115.
How much time is needed to produce 720 Joules of work if 90 watts of power is used? 
a)
0.125 s
b)
8 s
c)
64800 s
d)
80 s
116.
Would it be easier to move a box of the same mass up a ramp that was long and gradual or short and steep?
a)
long and gradual
b)
short and steep
117.

50 J of work is done lifting a 2.0 kg book in the air. How high was it lifted?

a)

2.6 m

b)

3.6 m

c)

1.0 m

d)

25 m

118.

How much energy is used by a 100 W light bulb over 1 hour? (be sure to convert to seconds first)

a)

100 J

b)

36,000 J

c)

360,000 J

d)

240,000 J

119.

Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who used more power?

a)

Bobby

b)

Carol

c)

They did the same amount of work

d)

Not enough information

120.

A 0.300 kg orange falls off a 1.2 m high table. How much kinetic energy does the orange have when it reaches the ground?

a)

3.5 J

b)

0.22 J

c)

0.40 J

d)

4.6 J

121.

A pendulum has 10 J of gravitational potential energy at its highest point. How much kinetic energy does it have at its lowest point?

a)

0 J

b)

2 J

c)

5 J

d)

10 J

122.

A 4 kg ball is at rest on a 2.5 m high shelf. The ball falls off the shelf. How fast is the ball moving when it hits the ground?

a)

49 m/s

b)

7 m/s

c)

12 m/s

d)

9.8 m/s

123.

Work is done only if

a)

a force is applied.

b)

the force applied causes the object's motion.

c)

an object is in motion.

124.

If you carry a 5 kg box across the room at a constant velocity

a)

you do no work.

b)

you do some work.

c)

you do negative work.

d)

Cannot be determined.

125.

On a work vs time graph, you can calculate the power by

a)

the area.

b)

the y-axis.

c)

the y-intercept.

d)

the slope.

126.

How much power was generated from 0-4 seconds?

a)

1100 W

b)

4 W

c)

267 W

d)

1600 W

127.

If it took 9 seconds for the object to move 6 meters, what's the power?

a)

81 W

b)

27 W

c)

3 W

d)

6 W

128.

What is the kinetic energy of a 10 kg ball moving at 3 m/s?

a)

15 J

b)

30 J

c)

45 J

d)

90 J

129.

A 5 kg cat falls off a 3 m tall fridge. What is the cat's PE as it starts to fall?

a)

15 J

b)

30 J

c)

150 J

d)

1470 J

130.

A 5 kg cat falls off a 3 m tall fridge. What is the cat's KE just before it lands on the floor?

a)

15 J

b)

30 J

c)

150 J

d)

1470 J

131.

What is the mass of an object with 1200 J of PE when it is 5 meters above the ground?

a)

10 kg

b)

24 kg

c)

100 kg

d)

240 kg

132.

What kind of energy(ies) does the car have at position A? The ground is h=0.

a)

KE

b)

KE + PE

c)

PE

d)

KE - PE

133.

If a system is isolated, the total energy of the system

a)

Increases constantly.

b)

Decreases constantly.

c)

Is constant.

d)

Depends on the work done on the system.

e)

Depends on the work done by the system.

134.

Which of the following is defined as an energy transfer?

a)

kinetic energy

b)

work

c)

potential energy

d)

chemical energy

135.

The unit of work is

a)

watt

b)

hertz

c)

joule

d)

pascal

136.

A light plastic cart and a heavy steel cart are both pushed with the same force for a distance of 1.0 m, starting from rest. After the force is removed, the kinetic energy of the light plastic cart is ________ that of the heavy steel cart.

a)

greater than

b)

equal to

c)

less than

d)

can't say unless we know how big the force is

137.

Each of the boxes shown is pulled for 10 m across a level, frictionless floor by the force given. Which box experiences the greatest change in its kinetic energy?

a)

A

b)

B

c)

C

d)

D

e)

E

138.

Rank in order, from largest to smallest, the gravitational potential energies of the balls.

a)

1 > 2 = 4 > 3

b)

1 > 2 > 3 > 4

c)

3 > 2 = 4 > 1

d)

3 > 2 > 4 > 1

139.

Starting from rest, a marble first rolls down a steeper hill, then down a less steep hill of the same height. Ignoring friction, for which is it going faster at the bottom?

a)

Faster at the bottom of the steeper hill

b)

Faster at the bottom of the less steep hill

c)

Same speed at the bottom of both hills

d)

Can’t say without knowing the mass of the marble

140.

A small child slides down the four frictionless slides A–D. Rank in order, from largest to smallest, her speeds at the bottom.

a)

vD > vA > vB > vC

b)

vD > vA = vB > vC

c)

vC > vA > vB > vD

d)

vA = vB = vC = vD

141.

Four students run up the stairs in the time shown. Which student has the largest power output?

a)

A

b)

B

c)

C

d)

D

142.

You are traveling along a freeway at 65 mi/h; your car has kinetic energy. You suddenly skid to a stop because of congested traffic. What happened to the kinetic energy your car just had?

a)

It is all in internal energy in the road

b)

It is all in internal energy in the tires

c)

Some of it has transformed to internal energy for the tires and the road, and some of it transferred away by sound energy and thermal energy into the air.

d)

It was destroyed

143.

A major league pitcher can throw a baseball with a kinetic energy of 150 J. How much work must the pitcher do to the ball to give it that much KE?

a)

150 J

b)

0

c)

Can’t tell without knowing the mass of the ball

144.

A rock has 10 J of potential energy on top of a roof. If it is dropped and lands with only 8 joules of kinetic energy, how much work did air resistance do on the rock?

a)

-18 J

b)

-10 J

c)

-8 J

d)

-2 J

145.

In the equation PE = mgh, what does the “g” mean?

a)

Acceleration due to gravity

b)

Force of gravity

c)

Weight of the object

146.

What is the unit for power?

a)

what

b)

watt

c)

joule

d)

Jewel-Osco

147.

Which requires more work – a person walking up stairs or a person running up stairs?

a)

walking

b)

running

c)

they require equal work

d)

no work is required for either because the movement is vertical

148.

Which requires more power – a person walking up stairs or a person running up stairs?

a)

walking

b)

running

c)

they require equal power output

d)

no power is required at all

149.

A basketball that is dropped bounces back up to its original height. Pick the correct energy transformation from the point when it was dropped until it returns to the original height.

a)

KE --> PE --> Elastic

b)

PE --> KE --> Elastic --> KE --> PE

c)

KE --> PE --> Elastic --> PE --> KE

d)

Elastic --> PE --> KE --> Elastic

150.

How much work is done on a 200-kg crate that is hoisted 2 m in a time of 4 s?

a)

400 J

b)

1000 J

c)

1600 J

d)

4000 J

151.

How much power is required to raise a 200-kg crate a vertical distance of 2 m in a time of 4 s?

a)

400 W

b)

1000 W

c)

1600 W

d)

4000 W

152.

If a charging elephant has kinetic energy, it must also have

a)

potential energy

b)

momentum

c)

work

d)

all of these

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