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Chapter 14/15 Work, Power, and Energy

Total questions: 72

Worksheet time: 3615secs

Name
Class
Date
1.
Two factors that determine work are
a)
size of the force, and distance
b)
size of the force, and type of force
c)
mass, and distance
2.
work is a measurement of how much force is applied over a certain
a)
distance
b)
velocity
c)
shape
d)
size
3.
units of force are
a)
netwons
b)
grams
c)
joules
d)
meters
4.
units for work are
a)
netwons
b)
joules
c)
meters
d)
seconds
5.
if you push a cart with a force of 60 N for 2 m... how much work have you done
a)
120 J
b)
30 J
c)
120 N 
d)
30 N
6.
work transfers
a)
sweat
b)
energy
c)
velocity
d)
effort
7.
energy in motion
a)
kinetic
b)
potential
8.
stored energy
a)
kinetic
b)
potential
9.
both work and energy are measured in 
a)
joules
b)
newtons
c)
meters
d)
seconds
10.
potential energy is mass (x) acceleration due to gravity (x) ?
a)
height
b)
distance
c)
size 
d)
mass
11.
You can change an object potential energy by changing their position or their
a)
shape
b)
mass
c)
size
d)
velocity
12.
if you lift a 2 kg box of toys to the top shelf of a closet that is 3 m high... how much PE will the box have
a)
58.8 J
b)
58.8 N
c)
6 J
d)
6 N
13.
In the formula for kinetic energy, what is being squared
a)
mass
b)
velocity
14.
Which type of energy is potential (+) kinetic
a)
mechanical
b)
thermal
c)
chemical
d)
electromagnetic
15.

To calculate work done on an object,

a)

divide distance by force

b)

divide distance by time

c)

multiply force by distance

d)

divide force by distance

16.
How much work is done in holding a 15 N sack of potatoes while waiting in line at the grocery store for 3 minutes?
a)
15 J
b)
45 J
c)
0 J
d)
5 J
17.
a push or pull is
a)
mass
b)
force
c)
inertia
d)
gravity
18.
Which is doing work?
a)
pushing a wall
b)
holding a box
c)
picking up a pencil
d)
sitting in a chair
19.

Frank does 2400 J of work in climbing a set of stairs. If he does the work in 6 seconds, what is his power output?

a)

14400 Watts

b)

400 Watts

c)

40 Watts

d)

0.0025 Watts

20.

A student who weighs 500 Newton's climbed the stairs from the first floor to the third floor, 15 meters above, in 20 seconds. What was her power output?

a)

375 Watts

b)

25 Watts

c)

300 Watts

d)

33 Watts

21.

If 55 Watts of power are used to do 275 J of work, how many seconds will it take for the work to be completed?

a)

1 second

b)

5 seconds

c)

0.2 seconds

d)

30 seconds

22.
What form of energy is being used when a person hits a tennis ball with a tennis racket?
a)
thermal energy
b)
sound energy
c)
light energy
d)
mechanical energy
23.
What type of energy increases as molecules move faster? 
a)
mechanical energy
b)
electrical energy
c)
thermal energy
d)
sound energy
24.
What type of energy is in this picture?
a)
Kinetic
b)
Potential
c)
Electromagnetic
25.
What kind of energy?
a)
Thermal (kinetic) energy
b)
Thermal (potential) energy
c)
Nuclear (kinetic) energy
d)
Mechanical (kinetic) energy
26.
What kind of energy?
a)
Thermal (kinetic) energy
b)
Chemical (kinetic) energy
c)
Chemical (potential) energy
d)
Mechanical (kinetic) energy
27.
What form of energy is stored in the bonds between molecules of matter?
a)
chemical energy
b)
heat energy
c)
kinetic energy
d)
mechanical energy
28.
the ability to do work
a)
energy
b)
Matter
c)
photons
d)
potential energy
29.
This would be
a)
Nuclear (kinetic) energy
b)
Nuclear (potential) energy
c)
Chemical (kinetic) energy
d)
Chemical (potential) energy
30.

Which of the following statements is true?

a)

To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in less time.

b)

To increase power, you can decrease the amount of work you do in a given amount of time, or you can do a given amount of work in more time.

c)

To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in less time.

d)

To increase power, you can increase the amount of work you do in a given amount of time, or you can do a given amount of work in more time.

31.

How many Horsepower is 12,500 watts?

a)

9,325,000 hp

b)

1776 hp

c)

28.03 hp

d)

17.76 hp

32.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
33.
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 
34.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
35.
A golf pro swings his driver which weighs 0.75Kg at a velocity of 60 m/s. Calculate the kinetic energy of the club.
a)
2700 J
b)
16.9 J
c)
1350 J
d)
45 J
36.

What is the kinetic energy of a zorb and human with a total mass of 90Kg rolling at 10m/s?

a)

3,700J

b)

900J

c)

4,500J

d)

6,500J

37.
An explosion of gas from a Hawaiian volcano blows a rock into the sky. the rock has 2000J of kinetic energy. What was its mass if the rock had a velocity of 20m/s
a)
200Kg
b)
20,000Kg
c)
10Kg
d)
200Kg
38.
The world record for pole vaulting is 6.15 m. If the pole vaulter's gravitational potential is 4942 J, what is his mass? 
a)
82 kg
b)
7875 kg
c)
803 kg
d)
.0012 kg
39.
One of the tallest radio towers is in Fargo, North Dakota.  The tower is 639m tall, or about 44 percent taller than the Sears Tower in Chicago.  If a bird lands on top of the radio tower, so that the gravitational potential energy associated with the bird is 2033J, what is its mass?
a)
3.08 kg
b)
31.17 kg
c)
0.32 kg
d)
13.13 kg
40.
In 1993, Cuban athlete Javier Sotomayor set the world record for the high jump.  The gravitational potential energy associated with Sotomayor’s jump was 1970J.  Sotomayor’s mass was 82kg.  How high did he jump?
a)
237.3 m
b)
15.83 km
c)
24 m
d)
2.45 m
41.
With an elevation of 5334m above sea level, the village of Aucanquilca, Chile is the highest inhabited town in the world.  What would be the gravitational potential energy associated with a 64kg person in Aucanquilca?
a)
3345484 J
b)
5407.8 J
c)
816.76 J
d)
72.31 J
42.
The kinetic energy of a golf ball is measured to be 143.3J.  If the golf ball has a mass of about 47g, what is its speed?
a)
2.46 m/s
b)
3367.55 m/s
c)
1.52 m/s
d)
6.09 m/s
43.
When a 65 kg skydiver jumps from a plane, her speed steadily increases until air resistance provides a force that balances the force due to free fall.  How fast is the skydiver falling if her kinetic energy at the moment is 704000J?
a)
21661.53 m/s
b)
147.17 m/s
c)
22880.0 km/s
d)
10830.76 m/s
44.

A crane carries an 8-m long steel girder weighing 2600 N out 12 m to the end of the crane. The crane did ___ of work.

a)

0 J

b)

2600 J

c)

20800 J

d)

31200 J

45.

Kinetic energy is associated with ---.

a)

speed

b)

position

c)

direction

d)

temperature

46.

A block starts at rest at point P at the top of a ramp which is height h above the ground. The block slides down one side and up the other, stopping at a point less than h above the ground.

a)

The block did not go as high on the other side because gravity pulls down.

b)

The block did not go as high on the other side because potential energy always has to decrease.

c)

The block did not go as high on the other side because work from friction made the mechanical energy less.

d)

The situation as described is impossible to happen.

47.

If there is no friction on this track, at which point would the coaster have the most kinetic energy?

a)

A

b)

B

c)

C

d)

D

48.

Where is the roller coaster gaining potential energy?

a)

A to B

b)

B to C

c)

C to D

d)

The roller coaster is always losing potential energy

49.

What effect do external forces like an applied force, friction force, or drag force have?

a)

They have no effect on a system's mechanical energy.

b)

They convert kinetic energy into potential energy.

c)

They convert potential energy into kinetic energy.

d)

They convert between mechanical energy and other forms of energy to change the total mechanical energy of the system.

50.

What is needed to calculate work?

a)

force

b)

distance

c)

time

d)

mass

51.

Which of these items is not part of the law of conservation of energy?

a)

energy cannot be created

b)

energy cannot be destroyed

c)

energy can be transferred between forms

d)

energy is destroyed by friction

52.
What type of energy is in this picture?
a)
Kinetic
b)
Potential
c)
Chemical
d)
Sound
53.
What kind of energy does this device use?
a)
Chemical
b)
Electrical
c)
Thermal
d)
Chemical
54.
A battery converts what type of energy to another?
a)
sound to kinetic
b)
light to heat
c)
mechanical to electrical
d)
chemical to electrical
55.
Energy of a rock perched on a cliff is an example of...
a)
gravitational
b)
elastic
c)
chemical
d)
kinetic
56.
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
57.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
58.
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 
59.
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
60.

In diagram 2, if the mass of the car is 600 kg, what is the change in potential energy from point A to point B?

a)

411,600 J

b)

294,000

c)

176,400 J

d)

117,600 J

61.

A weightlifter holds a 100 kg barbell above her head. Is work done?

a)

Yes because there is a force applied to the barbell and the force causes a displacement of the barbell.

b)

Yes because there is an upward force applied to the barbell and the barbell moves vertically.

c)

No because no displacement occurred.

d)

No because there is no force applied.

62.

How will you describe the energy at Point A?

a)

mostly potential energy

b)

mostly kinetic energy

c)

losing PE, gaining KE

d)

losing KE, gaining PE

63.

The "power" of a machine measures...

a)

The work it does

b)

The force it produces

c)

The rate of doing work

d)

Its strength

64.

It takes 60 J of work to push a large box 6 m across a floor. Assuming the push is in the same direction as the displacement, what is the magnitude of the force on the box?

a)

6 N

b)

10 N

c)

60 N

d)

360 N

e)

None of these

65.

When a car breaks to a stop, all its kinetic energy is converted to...

a)

Stopping Energy

b)

Potential Energy

c)

Chemical Energy

d)

Heat through friction

e)

Nuclear Energy

66.
Heat is the movement of ______.
a)
radiation
b)
thermal energy
c)
cold
d)
fire
67.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
68.
Energy transformations occur when...
a)
energy is created through conduction
b)
energy changes from one form to another
c)
two forces slide together that are touching
d)
a chemical reaction takes place
69.

What type of energy transformation occurs, when a hawk eats a mouse and then uses the energy from the mouse to fly?

a)

mechanical energy to chemical energy

b)

thermal energy to mechanical energy

c)

chemical energy to mechanical energy

d)

mechanical energy to thermal energy

70.
Which of the following energy transformations occur when a lamp that is plugged into a wall socket is functioning correctly?
a)
Chemical to light
b)
Electrical to chemical
c)
Electrical to light
d)
Chemical to electrical
71.
What best describes the energy conversion that occurs when you turn on a hair dryer?
a)
electric to kinetic to thermal and sound
b)
chemical to thermal to light and sound
c)
nuclear to electrical to thermal and sound
d)
kinetic to light to thermal and sound
72.
What two forms of energy are given off by a burning candle?
a)
heat and light
b)
mechanical and electrical
c)
nuclear and light
d)
potential and heat

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