Quiz about Chapter 14/15 Work, Power, and Energy

Question 1

Two factors that determine work are

Accepted Answer

size of the force, and distance

Answer

size of the force, and type of force

Answer

mass, and distance

Question 2

work is a measurement of how much force is applied over a certain

Accepted Answer

distance

Answer

velocity

Answer

shape

Answer

size

Question 3

units of force are

Accepted Answer

netwons

Answer

grams

Answer

joules

Answer

meters

Question 4

units for work are

Accepted Answer

joules

Answer

netwons

Answer

meters

Answer

seconds

Question 5

if you push a cart with a force of 60 N for 2 m... how much work have you done

Accepted Answer

120 J

Answer

30 J

Answer

120 N

Answer

30 N

Question 6

work transfers

Accepted Answer

energy

Answer

sweat

Answer

velocity

Answer

effort

Question 7

energy in motion

Accepted Answer

kinetic

Answer

potential

Question 8

stored energy

Accepted Answer

potential

Answer

kinetic

Question 9

both work and energy are measured in

Accepted Answer

joules

Answer

newtons

Answer

meters

Answer

seconds

Question 10

potential energy is mass (x) acceleration due to gravity (x) ?

Accepted Answer

height

Answer

distance

Answer

size

Answer

mass

Question 11

You can change an object potential energy by changing their position or their

Accepted Answer

shape

Answer

mass

Answer

size

Answer

velocity

Question 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

Accepted Answer

58.8 J

Answer

58.8 N

Answer

6 J

Answer

6 N

Question 13

In the formula for kinetic energy, what is being squared

Accepted Answer

velocity

Answer

mass

Question 14

Which type of energy is potential (+) kinetic

Accepted Answer

mechanical

Answer

thermal

Answer

chemical

Answer

electromagnetic

Question 15

To calculate work done on an object,

Accepted Answer

multiply force by distance

Answer

divide distance by force

Answer

divide distance by time

Answer

divide force by distance

Question 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?

Accepted Answer

0 J

Answer

15 J

Answer

45 J

Answer

5 J

Question 17

a push or pull is

Accepted Answer

force

Answer

mass

Answer

inertia

Answer

gravity

Question 18

Which is doing work?

Accepted Answer

picking up a pencil

Answer

pushing a wall

Answer

holding a box

Answer

sitting in a chair

Question 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?

Accepted Answer

400 Watts

Answer

14400 Watts

Answer

40 Watts

Answer

0.0025 Watts

Question 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?

Accepted Answer

375 Watts

Answer

25 Watts

Answer

300 Watts

Answer

33 Watts

Question 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?

Accepted Answer

5 seconds

Answer

1 second

Answer

0.2 seconds

Answer

30 seconds

Question 22

What form of energy is being used when a person hits a tennis ball with a tennis racket?

Accepted Answer

mechanical energy

Answer

thermal energy

Answer

sound energy

Answer

light energy

Question 23

What type of energy increases as molecules move faster?

Accepted Answer

thermal energy

Answer

mechanical energy

Answer

electrical energy

Answer

sound energy

Question 24

What type of energy is in this picture?

Accepted Answer

Potential

Answer

Kinetic

Answer

Electromagnetic

Question 25

What kind of energy?

Accepted Answer

Thermal (kinetic) energy

Answer

Thermal (potential) energy

Answer

Nuclear (kinetic) energy

Answer

Mechanical (kinetic) energy

Question 26

What kind of energy?

Accepted Answer

Chemical (potential) energy

Answer

Thermal (kinetic) energy

Answer

Chemical (kinetic) energy

Answer

Mechanical (kinetic) energy

Question 27

What form of energy is stored in the bonds between molecules of matter?

Accepted Answer

chemical energy

Answer

heat energy

Answer

kinetic energy

Answer

mechanical energy

Question 28

the ability to do work

Accepted Answer

energy

Answer

Matter

Answer

photons

Answer

potential energy

Question 29

This would be

Accepted Answer

Nuclear (kinetic) energy

Answer

Nuclear (potential) energy

Answer

Chemical (kinetic) energy

Answer

Chemical (potential) energy

Question 30

Which of the following statements is true?

Accepted Answer

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.

Answer

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.

Answer

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.

Answer

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.

Question 31

How many Horsepower is 12,500 watts?

Accepted Answer

17.76 hp

Answer

9,325,000 hp

Answer

1776 hp

Answer

28.03 hp

Question 32

The faster an object moves, the ________ kinetic energy it has.

Accepted Answer

more

Answer

less

Answer

none of the above

Answer

all of the above

Question 33

Gravitational potential energy depends on the ________ and ________ of the object.

Accepted Answer

Height and mass

Answer

Friction and movement

Answer

Mass and Movement

Answer

Height and Friction

Question 34

At which point is potential energy greatest?

Accepted Answer

W

Answer

X

Answer

Y

Answer

Z

Question 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.

Accepted Answer

1350 J

Answer

2700 J

Answer

16.9 J

Answer

45 J

Question 36

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

Accepted Answer

4,500J

Answer

3,700J

Answer

900J

Answer

6,500J

Question 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

Accepted Answer

10Kg

Answer

200Kg

Answer

20,000Kg

Answer

200Kg

Question 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?

Accepted Answer

82 kg

Answer

7875 kg

Answer

803 kg

Answer

.0012 kg

Question 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?

Accepted Answer

0.32 kg

Answer

3.08 kg

Answer

31.17 kg

Answer

13.13 kg

Question 40

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?

Accepted Answer

3345484 J

Answer

5407.8 J

Answer

816.76 J

Answer

72.31 J

Question 41

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?

Accepted Answer

2.46 m/s

Answer

3367.55 m/s

Answer

1.52 m/s

Answer

6.09 m/s

Question 42

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?

Accepted Answer

147.17 m/s

Answer

21661.53 m/s

Answer

22880.0 km/s

Answer

10830.76 m/s

Question 43

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.

Accepted Answer

0 J

Answer

2600 J

Answer

20800 J

Answer

31200 J

Question 44

Kinetic energy is associated with ---.

Accepted Answer

speed

Answer

position

Answer

direction

Answer

temperature

Question 45

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.

Accepted Answer

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

Answer

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

Answer

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

Answer

The situation as described is impossible to happen.

Question 46

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

Accepted Answer

D

Answer

A

Answer

B

Answer

C

Question 47

Where is the roller coaster gaining potential energy?

Accepted Answer

B to C

Answer

A to B

Answer

C to D

Answer

The roller coaster is always losing potential energy

Question 48

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

Accepted Answer

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

Answer

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

Answer

They convert kinetic energy into potential energy.

Answer

They convert potential energy into kinetic energy.

Question 49

What is needed to calculate work?

Accepted Answer

force

Accepted Answer

distance

Answer

time

Answer

mass

Question 50

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

Accepted Answer

energy is destroyed by friction

Answer

energy cannot be created

Answer

energy cannot be destroyed

Answer

energy can be transferred between forms

Question 51

What type of energy is in this picture?

Accepted Answer

Potential

Answer

Kinetic

Answer

Chemical

Answer

Sound

Question 52

What kind of energy does this device use?

Accepted Answer

Electrical

Answer

Chemical

Answer

Thermal

Answer

Chemical

Question 53

A battery converts what type of energy to another?

Accepted Answer

chemical to electrical

Answer

sound to kinetic

Answer

light to heat

Answer

mechanical to electrical

Question 54

Energy of a rock perched on a cliff is an example of...

Accepted Answer

gravitational

Answer

elastic

Answer

chemical

Answer

kinetic

Question 55

What is the formula for Kinetic Energy?

Accepted Answer

KE = 1/2m*v2

Answer

PE = m*g*h

Answer

W = F*d

Answer

P = W/t

Question 56

How do you calculate power?

Accepted Answer

P = W/t

Answer

P = E/t

Answer

P = w * t

Answer

P = bbq/chicken

Question 57

Gravitational potential energy depends on the ________ and ________ of the object.

Accepted Answer

Height and mass

Answer

Friction and movement

Answer

Mass and Movement

Answer

Height and Friction

Question 58

What is the formula for calculating the total amount of mechanical energy?

Accepted Answer

ME = KE + PE

Answer

KE = ME + PE

Answer

PE = KE + ME

Answer

ME = 1/2 mv²

Question 59

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?

Accepted Answer

117,600 J

Answer

411,600 J

Answer

294,000

Answer

176,400 J

Question 60

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

Accepted Answer

No because no displacement occurred.

Answer

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

Answer

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

Answer

No because there is no force applied.

Question 61

How will you describe the energy at Point A?

Accepted Answer

losing PE, gaining KE

Answer

mostly potential energy

Answer

mostly kinetic energy

Answer

losing KE, gaining PE

Question 62

The "power" of a machine measures...

Accepted Answer

The rate of doing work

Answer

The work it does

Answer

The force it produces

Answer

Its strength

Question 63

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?

Accepted Answer

10 N

Answer

6 N

Answer

60 N

Answer

360 N

Answer

None of these

Question 64

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

Accepted Answer

Heat through friction

Answer

Stopping Energy

Answer

Potential Energy

Answer

Chemical Energy

Answer

Nuclear Energy

Chapter 14/15 Work, Power, and Energy

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