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Energy, Work, & Power

Total questions: 75

Worksheet time: 2hrs 35mins

Name
Class
Date
1.

The SI unit for WORK is:

a)

Joules

b)

Watts

c)

Newtons

d)

Kilogram

2.

The SI unit for POWER is:

a)

Watts

b)

Joules

c)

Newtons

d)

Meters

3.
What is the formula for Gravitational Potential Energy?
a)
PE = m*g*h
b)
KE = 1/2m*v2
c)
W = F*d
d)
P = W/t
4.
What is the formula for Kinetic Energy?
a)

PE = m*g*h

b)

KE = 12mv2\frac{1}{2}mv^2

c)

W = F*d

d)

P = W/t

5.

A 180 gram softball is thrown into the air using 40 J of work. The ball rises to its maximum height in 1.96 seconds. How much power was exerted throwing the ball?

a)

144 W

b)

20.4 W

c)

3.52 W

d)

2.11W

6.

Assuming no friction or air resistance, at what point in a pendulum's swing is its Mechanical energy the least?

a)

At the very bottom of its path

b)

Its mechanical energy is constant throughout

c)

Half way between the top and bottom of its path

d)

At the very top of its path

7.

Where does the pendulum have the least amount of potential energy?

a)

A

b)

B

c)

C

d)

D

e)

E

8.

Newtons (N) are the unit for __________.

a)

Work

b)

Distance

c)

Acceleration

d)

Force

9.

Kinetic Energy is defined as:

a)

Energy stored due to its location

b)

Energy of motion

c)

Energy stored in the bonds of molecules

d)

Thermal (Heat) energy

10.

What is the height of a 3200-kg plane if it has 960000 J of potential energy?

a)

10.2 m

b)

30.6 m

c)

307200000 m

d)

300 m

11.

A driver continuously pushes a car stuck in the mud with 900N of force for 70 seconds. The car does not budge. How much work has the driver done on the car?

a)

63000 J

b)

0 J

c)

12.9 J

d)

6300 J

12.
A girl on a motorbike passes by at a speed of 15 m/s. Her mass is 40 kg. What is her kinetic energy? 
a)
300 Joules
b)
600 Joules
c)
950 Joules
d)
4500 Joules
13.
Which character has the greatest gravitational potential energy?
a)
Character A
b)
Character B
c)
Character C
d)
Character D
14.
According to the Law of Conservation of Energy, energy cannot be _________ or ____________. 
a)
destroyed, destroyed
b)
created, saved
c)
created, destroyed
d)
lost, found
15.

What is the KE at the bottom?

a)

15,000 J

b)

3,750 J

c)

7,500 J

d)

11,250 J

16.

A runner exerts 222,000 J when she runs for 60 seconds. What is the runner's power?

a)

3700 W

b)

600 W

c)

400 J

d)

60 J

17.

A typical internal combustion engine only converts 20-40% of the potential energy stored in fuel to the mechanical movement of the car. Where does a majority of the energy go?

a)

Lost as Light Kinetic energy

b)

Lost as Thermal energy

c)

Lost as Elastic Potential energy

d)

Lost as Gravitational Potential energy

18.

Energy stored inside a leaf would be considered to be:

a)

electrical

b)

chemical

c)

thermal

d)

mechanical

19.

Energy from a compressed spring would be an example of:

a)

kinetic

b)

elastic potential

c)

gravitational potential

d)

chemical potential

20.

What is the difference between calculating Power and Work?

a)

Power takes the time of a task into account

b)

Work takes into account the time it takes to complete a task

c)

Power is the amount of force divided by area used

d)

Work is the amount of seconds needed for energy transfer

21.

Energy that is stored in bonds between atoms in compounds is:

a)

Mechanical energy

b)

Chemical energy

c)

Kinetic energy

d)

Nuclear energy

22.
When does an object have no kinetic energy?
a)
when it is at rest
b)
when it is moving very slowly
c)
when the only force that is acting on it is gravity
d)
when it has no electrical charge
23.

What is the formula for calculating Power?

a)

P = Fd

b)

P = ham

c)

P = W/t

d)

P = Wt

24.

Energy released when the nucleus of atoms split (fission) or join together (fusion) is called:

a)

Thermal

b)

Radiant

c)

Elastic

d)

Nuclear

e)

Chemical

25.

Energy cannot be created or destroyed. But, it can be _____.

a)

transformed

b)

increased

c)

decreased

d)

evaporated

26.

Energy made available through the flow of electric current through a conductor is called:

a)

Radiant

b)

Thermal

c)

Electrical

d)

Kinetic

27.

Energy that is carried by light is referred to as:

a)

Radiant

b)

Thermal

c)

Kinetic

d)

Potential

e)

Electrical

28.

What is potential energy?

a)

The energy an object has due to its atomic structure.

b)

The energy an object has due to its chemical composition.

c)

The energy an object has due to its motion.

d)

The energy an object has due to its position or condition.

29.

Gravitational potential energy depends on the strength of gravity, ________ and ________ of the object.

a)

height and mass

b)

friction and movement

c)

mass and movement

d)

height and friction

30.

What is the value of the Earth's acceleration due to gravity (g)?

a)

9.8 m/s2

b)

100 m/s2

c)

25 m/s2

d)

3.14 m/s2

31.

Wood, batteries, gasoline, and food are all examples of ____________.

a)

gravitational potential energy

b)

elastic potential energy

c)

chemical potential energy

d)

kinetic (heat) energy

32.

A exercise ball is on a table 2.5 m above the ground. What is the mass of the ball if it has a GPE of 56.8 J?

a)

71 kg

b)

22.72 kg

c)

142 kg

d)

2.32 kg

33.
Which energy conversion is taking place when you put gasoline in a car?
a)

nuclear kinetic -> electrical, radiant, and sound

b)

mechanical potential -> electrical and elastic

c)

chemical potential -> Kinetic, sound and thermal

d)

thermal -> electromagnetic and kinetic

34.
Which of these is an example of light energy being transformed into chemical energy?
a)
A glow stick lights up when broken.
b)
Water heated by the sun evaporates.
c)
A plant makes sugar in the sunlight.
d)
A battery causes a buzzer to vibrate.
35.

What would 54N be an example of?

a)

work

b)

power

c)

distance

d)

force

36.

If you increase your work and decrease your time, you will have:

a)

more power

b)

less power

c)

the same amount of power

d)

power rating cannot be determined

37.

What are the two types of Mechanical Energy (ME)?

a)

Kinetic & Potential

b)

Potential & Thermal

c)

Kinetic & Electrical

d)

Electrical & Thermal

38.

A cheetah can run briefly with a speed of 31 m/s. Suppose a cheetah with a mass of 47 kg runs at this speed. What is the cheetah’s kinetic energy?

a)

1457 J

b)

728.5 J

c)

45,167 J

d)

22,583.5 J

39.

This picture represents a diver’s motion from the top of a high diving board into a pool of water. At what point does the diver have the greatest kinetic energy and the least potential energy?

a)

1

b)

2

c)

3

d)

4

40.

Water currents that flow from the equator to the poles move heat from warmer climates to colder ones are an example of which transfer of heat?

a)

Conduction

b)

Convection

c)

Radiation

d)

Reduction

41.

What type of heat transfer is the following?

Solar panels are used to collect sunlight for energy.

a)

Convection

b)

Conduction

c)

Radiation

d)

None of the above

42.

In the following example, identify the type of heat transfer.

You hold an ice cube in your hand and it begins to melt.

a)

Radiation

b)

Convection

c)

Conduction

43.

In the following example, identify the correct type of heat transfer:

You feel the warmth from the sun on your face.

a)

Convection

b)

Conduction

c)

Radiation

d)

Reduction

44.

In terms of Thermal Energy, heat will:

a)

Always flow from the warmer object when its above 50⁰C

b)

Always flow from higher temperatures to lower temperatures

c)

Always flow from lower temperatures to higher temperatures

d)

It depends on the temperature

45.
What is the equation to measure change in Thermal Energy?
a)
Q=mc∆t
b)
Q=mc
c)
Q= ∆mct
d)
m=QC
46.

There are four cups of hot cocoa. The cup sizes are shown. The temperature of the cocoa in each cup is 25 degrees Celsius. Which cup has the MOST thermal energy?

a)

Large cup (Trenta)

b)

Small cup (Tall)

c)

Medium cup (Venti)

d)

All three are the same temperature so they have the same thermal energy

e)

Grande cup

47.

Which material from the list will take the most energy to heat and raise its temperature?

a)

liquid water

b)

Lead

c)

Granite

d)

Iron

e)

water vapor

48.

The specific heat of platinum is 150 J/kg°C. How much heat (Q) is released when a 12 kg piece of platinum cools from 100°C to 50°C?

a)

90000 J

b)

665 J

c)

-90000 J

d)

0.665 J

e)

-7500 J

49.

During a PennDOT laboratory evaluation, a 25 kg piece of Asphalt heats from 22⁰C to 40⁰C. If it took 411750J of heat to do this, what is the Specific Heat of Asphalt?

a)

105 J/kg⁰C

b)

130.5 J/kg⁰C

c)

880 J/kg⁰C

d)

915 J/kg⁰C

50.

If 68 W of power is produced in 18 seconds, how much Work is done?

a)

1224 J

b)

0.264 J

c)

3774 J

d)

12.24 J

51.
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

52.

A 5.8 kg crate is pushed across the floor for 4.5 meters. How much Work was done on the crate?

a)

26.1 J

b)

255.78 J

c)

12.63 J

d)

272.32 J 

53.
As the skier goes down the hill, ________ energy increases while _______ energy decreases.
a)
Gravitational; Kinetic
b)
Kinetic; Gravitational
c)
Elastic; Kinetic
d)
Kinetic; Elastic
54.
A motor does 6,800 Joules of work raising an injured man off of Camelback Mountain onto a helicopter. The average power of the motor during the airlift was 750W. How long did it take to airlift the patient?
a)
0.110 seconds
b)
7.5 seconds
c)
9.07 seconds
d)
11.1 seconds
55.

If mass is doubled what happens to the amount of kinetic energy an object has?

a)

KE doubles

b)

KE is cut in half

c)

KE is reduced to 1/4

d)

KE is quadrupled

56.

____________ is the ability to do work or cause change.

a)

Energy

b)

Force

c)

Friction

d)

Motion

57.

What is the correct unit for mass in energy equations?

a)

Kilogram (Kg)

b)

Newton (N)

c)

Joule (J)

d)

Watt (W)

e)

Gram (g)

58.

What is the KE half way down the ramp?

a)

50 J

b)

25 J

c)

0 J

d)

100 J

59.

What is the total Mechanical Energy at point A?

a)

500,000 J

b)

400,000 J

c)

200,000 J

d)

50,000 J

60.

At which point in the picture must the cart have the most MECHANICAL energy (assuming no friction)?

a)

Point 1

b)

Point 2

c)

Point 3

d)

They would all be the same

61.

What is Thermal Energy?

a)

Energy produced while moving through an electric current

b)

Energy that sound carries in the form of large waves

c)

The sum of the potential and kinetic energy of the particles in an object.

d)

The energy that electromagnetic waves carry through atomosphere

62.

What is an example of sound energy?

a)

A thermometer heating up

b)

Solar panels generating electricity

c)

A guitar string being plucked

d)

A machine in an assembly line

63.

What type of energy transformation occurs in a toaster?

a)

Electrical to radiant only

b)

Electrical to thermal and radiant

c)

Thermal to mechanical and electromagnetic

d)

Solar to electrical and chemical

64.

What type of energy transformation occurs when a piece of wood burns?

a)

Electrical energy is released as radiant and chemical energy

b)

Chemical energy is released as thermal and radiant energy

c)

Mechanical energy is stored as chemical energy

d)

No transformation occurs

65.
What would be the effect on the particles if more heat is supplied to the system?
a)
They would slow down
b)
They would stop moving
c)
They would speed up
d)
There would be no effect
66.

A sample of iron receives 50.0 J of heat energy that raises the temperature of the iron by 25.0°C. If iron has a specific heat of  0.10 J/g°C, what is the mass of the iron sample?

a)

25 g

b)

30 g

c)

20 g

d)

50 g

67.
What is the symbol for Thermal Energy?
a)
Q
b)
T
c)
m
d)
Cp
68.

What is the measurement of the average kinetic energy of the particles of a substance? (a)  

Choose from the below words
Temperature
Kinetic energy
Thermal energy
Potential energy
69.

Match the following

a)

conduction

1.

ironing a shirt

b)

convection

2.

hot air currents heating a cold room

c)

radiation

3.

a microwave heating food

70.

The amount of energy required to raise the temperature 1ºC for every gram or kilogram is called____?

a)

Thermal Energy

b)

Specific Heat

c)

Temperature

d)

Kinetic Energy

e)

Heat Value

71.
What is a insulator?
a)

a material that slows the transfer of heat

b)

a material that transfers heat easily

c)

a material that is fluffy and soft

d)

a material that is kept at a lower temperature

72.

What is the BEST example of a conductor of thermal energy?

a)

A wooden block

b)

A wool oven mitt

c)

A plastic mug

d)

A metal pan

73.

What is a Conductor?

a)

a material that slows the transfer of heat

b)

a material that transfers heat easily

c)

a material that is retains and measures heat transfer

d)

a material that is temperature controlled

74.

Which of the following is a good conductor of heat and electricity?

a)

newspaper

b)

copper wire

c)

glass plate

d)

plastic bottle

75.

All of the following are true regarding Einstein's equation, E=mc2 EXCEPT:

a)

The equation evaluates something called "Rest Energy"

b)

It proves that mass and energy are interrelated

c)

It proves that the speed of light a constant value (3 x 108 m/s)

d)

It proves that energy can be created at the speed of light

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