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Work,power, and energy test

Total questions: 70

Worksheet time: 2hrs 39mins

Name
Class
Date
1.

Which of the following is the best example of work being done on an object?

a)

holding a 50 kg barbell

b)

keeping a board in place

c)

lifting a bag of groceries

d)

pushing on a car that will not move

2.

Mechanical energy does not include

a)

kinetic

b)

potential

c)

thermal

3.

Energy due to elevation is

a)

mechanical

b)

kinetic

c)

elastic potential

d)

gravitational potential

e)

internal

4.

Energy due to motion is

a)

mechanical

b)

kinetic

c)

elastic potential

d)

gravitational potential

e)

internal

5.

When mechanical energy increases

a)

positive work is done

b)

no work is done

c)

negative work is done

6.

A pendulum swings back and forth. What happens to most of its gravitational potential energy at the bottom of its swing?

a)

It is transformed into inertia.

b)

It is transformed into thermal energy.

c)

It is transformed into kinetic energy.

d)

It is transformed into chemical potential energy.

7.

T or F? Carrying your backpack from one desk to another is an example of doing work.

a)

true

b)

false

8.

Work is

a)

a type of mechanical energy

b)

a transfer of mechanical energy

c)

a type of thermal energy

d)

a transfer of thermal energy

9.

Heat is

a)

a type of mechanical energy

b)

a transfer of mechanical energy

c)

a type of thermal energy

d)

a transfer of thermal energy

10.

You hold a 50 N bag of nails. After 2 seconds, how much work have you done?

a)

0 J

b)

25 J

c)

50 J

d)

100 J

11.

You move a 20 N box from a 2 m high shelf to the floor. The amount of work you have done is

a)

40 J

b)

10 J

c)

- 10 J

d)

- 40 J

12.

A 25 N force moves an object a distance of 2 m at a speed of 3 m/s. The work done (in Joules) is

(a)  

13.

Which doesn't belong?

a)

kinetic

b)

potential

c)

work

d)

thermal

14.

Average molecular kinetic energy is also called

(select all that apply)

a)

heat energy

b)

thermal energy

c)

internal energy

15.

Driving at 10 mph, a car can stop in 20 feet. When the same car is traveling at 20 mph, the stopping distance is

a)

20 feet

b)

40 feet

c)

60 feet

d)

80 feet

e)

100 feet

16.

Energy is measured in

a)

Joules

b)

Newtons

c)

Watts

d)

kg•m/s

17.

The unit Joule is the same as

a)

Newton-second

b)

Newton-meter

c)

Newton/second

d)

Newton/meter

18.

When positive work is done

a)

energy increases.

b)

energy is conserved.

c)

energy decreases.

19.

When positive work is done on an object it can

(select all that apply)

a)

speed up

b)

slow down

c)

move up

d)

move down

e)

neither change speed nor change height

20.

When zero work is done on an object it can

(select all that apply)

a)

speed up

b)

slow down

c)

move up

d)

move down

e)

neither change speed nor change height

21.

Select the forms of energy.

a)

kinetic

b)

potential

c)

work

d)

thermal

e)

heat

22.

The unit Watt is the same as

a)

Joule-second

b)

Joule-meter

c)

Joule/second

d)

Joule/meter

23.

How much power (in Watts) is required to lift a 5 kg mass at a speed of 3 m/s?

(a)  

24.

How much energy (in Joules) does a 60W lightbulb use in 1 second?

(a)  

25.

How much energy (in Joules) does a 40W lightbulb use in 10 seconds?

(a)  

26.

You do 36 J of work in stretching a really big rubber band. If the rubber band has a mass of 2 kg, what is the speed of the rubber band (in m/s) when you launch it across the room?

(a)  

27.

if 105 J of energy is used in 103 seconds, what is the average power consumption in Watts?

a)

10210^2  W

b)

10810^8  W

c)

101110^{11}  W

d)

101510^{15}  W

28.

unit of work is

a)

joule

b)

Newton

c)

Watt

d)

kg

29.

The unit of energy is

a)

joule

b)

Newton

c)

Watt

d)

kg

30.

You try to push a heavy trolley along the floor with a force of F=100 N. You push on the box at an angle of &= 45 degrees to the horizontal and it moves 2 m. How much horizontal force is exerted on the box

Fx= F x cos & 

a)

71 N

b)

71 J

c)

3195 N

d)

2560 J

31.

You have to push with 15 N of force to move it 10 meters. How much work do you do?

a)

15 Joules

b)

150 Joules

c)

1.5 Joules

d)

.67 Joules

32.

500 J of work is done by a person who uses a force of 50N to move a box, how far does it go?

a)

10 m

b)

0.1 m

c)

25,000 m

d)

10 J

33.

Newtons are the unit for _____________.

a)

Work

b)

Distance

c)

Acceleration

d)

Force

34.

You exert 200 J of work by pulling on an object with 20 N of force. What distance is the object moved?

a)

.01 m

b)

10 m

c)

10 J

d)

4,000 m

35.

_____________ is the rate of doing work.

a)

Conservation of energy

b)

Joules

c)

Energy

d)

Power

36.

Power is measured in ___________.

a)

meters

b)

joules

c)

newtons

d)

watts

37.

You do 40 Joules of work in 8 seconds. How much power did you exert?

a)

0.2 watts

b)

320 watts

c)

5 watts

38.

The law of Conservation of Energy says________

a)

energy is constantly created

b)

energy can not be created or destroyed instead it changes from one form to another

c)

energy can not change forms

39.

Two factors that determine work are

a)

force

b)

acceleration

c)

mass

d)

distance

e)

velocity

40.

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

41.
Which situation is work not done?
a)
lifting a 20 pound box off the floor
b)
holding a 20 pound box above the floor
c)
sliding a 20 pound box across the floor
d)
sliding a 20 pound box up an inclined plane
42.

In which scenario is work = 0 J ?

a)

Pushing a stationary wall

b)

Pulling a trolley car

c)

Pushing a book across the table

d)

Dropping a set of keys from a height, h.

43.

A cheetah can run briefly with a speed of 31.0 m/s. Suppose a cheetah with a mass of 47.0 kg runs at this speed. What is the cheetah’s kinetic energy?

a)

1457 Joules

b)

22,584 Joules

c)

15 Joules

d)

45,167Joules

44.
Calculate the kinetic energy of a moving 4 kg object travelling at a velocity of 3 m/s.
a)
18 J
b)
36 J
c)
12 J
d)
6 J
45.
How much kinetic energy does a moving 6 kg object have if it moves with a velocity of 3 m/s?
a)
27 J
b)
18 J
c)
9 J
d)
2 J
46.
As mass increases, KE ...
a)
increases
b)
decreases
c)
stays the same
47.
A moving 10 kilogram object has 20 Joules of kinetic energy. What is its velocity?
a)
2 m/s
b)
4 m/s
c)
200 m/s
d)
10 m/s
48.
What is the mass of a moving object that has 100 Joules of kinetic energy and moves at a velocity of 2 m/s?
a)
50 kg
b)
200 kg
c)
25 kg
d)
100 kg
49.
At which point(s) on the roller coaster is the gravitational potential energy at its maximum?
a)
A
b)
B
c)
C
d)
D
50.
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 
51.

A girl weighs 400 N. She runs up a flight of stairs of height 5 m in 4 seconds. Her power is:

a)

320 W

b)

400 W

c)

500 W

d)

2 000 W

52.
Groot rescues Rocket from the bottom of a deep pit. Groot expends 1000 J of energy lifting Rocket who has a mass of 50 kg out of the pit. How deep is the pit?
a)
0.5 m
b)
2 m
c)
4 m
d)
10 m
53.

Which energy-conversion chain occurs whenever coal is burned to create steam to spin the generator at a power station?

a)

chemical to mechanical to potential

b)

thermal to chemical to mechanical to electrical

c)

chemical to thermal to mechanical to electrical

d)

chemical to chemical to mechanical to radiant

54.

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.

55.

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

56.

If you use 30 J of energy to move an object, you have done ____ J of work.

a)

3

b)

10

c)

30

d)

0

57.
A Mustang has more horsepower than your mom's minivan. What does this mean?
a)
The Mustang has a higher topspeed.
b)
The minivan has a worse gas mileage.
c)
The Mustang can do work faster.
d)
The Mustang will die.
58.

A 40-kg person is climbing 3 m up a flight of stairs in 6 seconds. How much power did they exert climbing the stairs?

a)

400 W

b)

1200 W

c)

200 W

d)

120 W

59.

The photo shows a power plant which gets energy by drilling deep into the earth.

What is the name of this type of energy?

a)

Geothermal

b)

Hydroelectric

c)

Biomass

d)

Solar

60.

The photo shows different fuels burning.

Which one of the following fuels is NOT regarded as a fossil fuel?

a)

Wood

b)

Coal

c)

Oil

d)

Natural gas

61.
A disadvantage of nuclear power is that
a)
it produces toxic waste
b)
it produces carbon dioxide which is responsible for global warming
c)
it affects the ozone layer
d)
it requires large amounts of fuel to produce a small amount of energy
62.

Producing electrical energy causes a certain amount of pollution.

Which one of the following energy sources has the HIGHEST level of pollution?

a)

Nuclear energy

b)

Solar energy

c)

Hydroelectric energy

d)

Tidal energy

e)

Wind energy

63.
With all of his Batgear on, Batman has a mass of 90.7 kg. How much potential energy does he have if he's perched on top of a 1,575 m building? 
a)
142,852.5 J
b)
1,399,954.5 J
c)
0.058 J
d)
17.36 J
64.
Roger Federer’s tennis ball has a mass of 0.3 kg. If he holds the ball above the ground at a height of 2.0 m to serve, what is its gravitational potential energy (GPE)?
a)
5.88 J
b)
0.6 J
c)
6.67 J
d)
0.15 J
65.
Gravity on Jupiter is 24.79 m/s2. If a 5 kg box is 32 m above the surface of Jupiter, calculate the GPE of the box.
a)
160 J
b)
3,966.4 J
c)
158.66 J
d)
6.45 J
66.

The blades of a toy helicopter spin when its circuit is connected to a battery. Which sequence below correctly identifies the energy changes taking place in the helicopter?

a)

chemical to electrical to potential

b)

chemical to electrical to mechanical

67.

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

68.
When work is done, energy is transferred or transformed.
a)
True
b)
False
69.
Energy and work have the same units (joules) of measurement.
a)
True
b)
False
70.
People get energy from the food that they eat and transform that energy as they move. Which energy transformations occur as a student rapidly rubs the palms of his hands together?
a)
mechanical to thermal to electrical
b)
chemical to mechanical to thermal
c)
mechanical to chemical to sound
d)
chemical to sound to electrical

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