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Test Review: Unit 9 and Unit 10: Work, Power, Energy, Heat

Total questions: 82

Worksheet time: 19hrs 35mins

Name
Class
Date
1.
True or false
You do work only when you exert a force on an object and move it
a)
true
b)
false
2.
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
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.
both work and energy are measured in 
a)
joules
b)
newtons
c)
meters
d)
seconds
8.
energy in motion
a)
kinetic
b)
potential
9.
stored energy
a)
kinetic
b)
potential
10.

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

a)

height

b)

distance

c)

size

d)

mass

11.
true or false
the faster an object moves the more kinetic energy it has
a)
true
b)
false
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.
True or false
energy is conserved
a)
true
b)
false
15.
Which type of energy is potential (+) kinetic
a)
mechanical
b)
thermal
c)
chemical
d)
electromagnetic
16.

Work on an object is maximized when

a)

some of the force is applied in the direction of movement.

b)

all of the force is applied in the direction of movement.

c)

none of the force is applied in the direction of movement.

17.

True or False ... There must be movement in order for work to be done on an object.

a)

True ... as long as the movement is in the direction of the force.

b)

True ... and it doesn't matter which direction the applied force is in.

c)

False ... Work is always done on an object whenever a force is applied to it.

18.

Each of the following is an example of work done on an object except

a)

doing 50 push-ups and 50 sit-ups every night before you go to bed to relieve the stress of science class.

b)

lifting a bag of groceries into the trunk of the car.

c)

removing shovel-fulls of dirt to dig a hole.

d)

carrying a bag of groceries under you arm to the car.

19.

How much work is done by a team of sled dogs that provides a force of 2000 N to move a sled 50 m?

a)

40 J

b)

100,000 J

c)

1,950 J

d)

10,000 J

20.

Power is measured in units called

a)

Joules

b)

Watts

c)

Newtons

d)

Pounds

21.

If a machine uses 100 J of work to lift a heavy object in 10 seconds, how much power does it generate?

a)

1000 W

b)

10 W

c)

90 W

d)

0.1 W

22.
A 5000N block is lifted 10 m. How much work was done?
a)
50000 J
b)
5000 J
c)
500 J
d)
50 J
23.
The amount of work done in a certain amount of time is known as 
a)
work
b)
effort force
c)
resistance force 
d)
power
24.

True or false

You do work when you mannequin pose with an object in your hand.

a)

true

b)

false

25.

If 40N of force is applied to Rollo Koster's 10 kg cart over a distance of 50 meters, how much work is done?

a)

8000J

b)

8000N

c)

4000J

d)

2000J

26.
A person applies a force to a wall. 
a)
  Work is done because the person uses energy when applying the force  
b)
Work is done because the wall heats up at the place where the force is applied  
c)
No work is done
27.
A boy pushes on a parked car with a force of 200 N. The car does not move. How much work does the boy do on the car?

a)
200N
b)
200J
c)
0J
d)
0N
28.
you lift grocery bags out of the trunk
a)
Work
b)
Not Work
29.
Which one is a unit of distance?
a)
meter (m)
b)
gram (g)
c)
liter (L)
d)
Joule (J)
30.

Which one is a unit of mass?

a)

meter (m)

b)

kilogram (kg)

c)

Joule (J)

d)

Newton (N)

31.
Fred kicks a ball with a force of 20N to George, who is 5M away. How much work was done to the ball?
a)
25J
b)
100J
c)
4J
d)
75J
32.
A force of 100 newtons was necessary to lift a rock.  A total of 150 joules of work was done.  How far was the rock lifted?
a)
1.5m
b)
15,000 m
33.
What is the power of a kitchen blender if it can perform 3,750 joules of work in 15 seconds?
a)
56, 250 watts
b)
250 watts
34.
How do you know when a force has been applied to an object?
a)
It moves.
b)
It flies.
c)
It accelerates.
d)
It gets bigger.
35.
What is the equation for calculating power?
a)
distance / time
b)
work x time
c)
work / time
d)
force x distance
36.
When it comes to lifting an object, a person must overcome____.
a)
force
b)
gravity
c)
work
d)
power
37.
Calculate the power for the following problem: w: 253 J; t: 10 s
a)
25.3 W
b)
25.5 W
c)
25.6 W
d)
25.2 W
38.
An elevator does 12,000 newton·meters of work in 11.0 seconds. What is the power used by the elevator?
a)
 1,090 watts
b)
1,000 watts
c)
1,100 watts
d)
1,009 watts
39.
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
40.
An engine reaches its top speed from rest in 7.5 s. It is able to perform 250,000 J of work in that time.  How much power does this engine have in that time? 
a)
0.00003 W
b)
33,333 W
c)
1,875,000 W
d)
1873 W
41.
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
42.
If 68 W of power is produced in 18 seconds, how much work is done?
a)
1,224 J
b)
0.264 J
c)
3.77 J
d)
12.24 J
43.
What units are used to measure power?
a)
watts
b)
Joules
c)
meters
d)
newtons
44.
Mechanical energy
a)
energy built up before being in motion
b)
energy released in a chemical reaction
c)
energy of motion
d)
sum of kinetic and potential energy
45.
When an object is in motion, it has ___________ energy.
a)
potential
b)
mechanical
c)
kinetic
d)
movement
46.
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 
47.
At which point is potential energy greatest?
a)
W
b)
X
c)
Y
d)
Z
48.
When plants convert the sun's energy into food, which type of energy is it?
a)
kinetic
b)
chemical
c)
thermal
d)
radiant
49.
In order to INCREASE the potential energy of an object, you need to:
a)
put the object lower to the ground
b)
raise the object higher
50.
Is this activity as an example of potential or kinetic energy Choose “PE” or “KE”:
A child on his way down a playground slide.
a)
PE
b)
KE
51.
Is this activity as an example of potential or kinetic energy Choose “PE” or “KE”:
The flexed string of an archer’s bow.
a)
PE
b)
KE
52.
Does a rock on the top of a cliff have potential energy or kinetic energy?
a)
Potential
b)
Kinetic
53.
Which of the following is NOT true about Potential Energy?
a)
An object's position affects its potential energy
b)
Potential energy is Stored energy
c)
Potential energy only occurs when an object is in motion
d)
All objects have potential energy
54.
While a boulder is on the top of a hill it has what type of energy? 
a)
Mechanical
b)
Kinetic
c)
Potential 
d)
Reactive 
55.
What is energy?
a)
rate of work
b)
Motion of an object
c)
ability to do work
d)
force over time
56.

What are the two factors that affect kinetic energy?

a)

time and energy

b)

power and mass

c)

mass and velocity

d)

time and work

57.
What is the unit of measurement for kinetic energy
a)
Newton
b)
Joule
c)
Watt
d)
Kilogram
58.
What kind of energy is in a moving skateboard?
a)
Potential
b)
Kinetic
59.
When a pendulum swings, at which point is kinetic energy highest?
a)
1
b)
2
c)
3
d)
4
60.
When a pendulum swings, at which point is potential energy at its greatest?
a)
1
b)
2
c)
3
d)
4
61.

Figure the PE.

mass= 3 kg

gravity= 9.8m/s2

height= 40m

a)

1176

b)

1716 J

c)

1176 J

d)

1761

62.

Solve

PE= 52 J

mass= ?

gravity= 9.8 m/s2

height= 18 m

a)

.29 kg

b)

1.76 m

c)

2.9 kg

d)

176.4 m

63.

Solve for h.

PE= 74 J

mass= 3.8 kg

gravity= 9.8 m/s2

height= ?

a)

1.99 m

b)

199

c)

19.9 m

d)

19 m

64.

Calculate the kinetic energy of a truck that has a mass of 2900 kg and is moving at 55 m/s.

a)

4,386,250 J

b)

438625

c)

4.38 kg

d)

438,625 m/s

65.

Calculate the potential energy of a rock with a mass of 55 kg while sitting on a cliff that is 27 m high.

a)

14 J

b)

1453 J

c)

15453 kg

d)

14,553 J

66.

A roller coaster has a mass of 250 kg, and is 50 meters above the ground, what is the potential energy?

a)

122,625 Joules

b)

5,600 Joules

c)

234,799 Joules

d)

122,500 Joules

67.
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)
15,500 Joules
b)
22,583 Joules
c)
15 Joules
d)
45,543 Joules
68.
Thermal energy ALWAYS moves from _____ to _____.
a)
solid to liquid
b)
ice to water
c)
hot to cold
d)
solid to gas
69.
Heat moves by ______ when it travels through waves.
a)
radiation
b)
conduction
c)
insulator
d)
convection
70.
Heat moves by ______ when it travels from one solid to another solid.
a)
radiation
b)
convection
c)
thermal energy
d)
conduction
71.
The way heat moves in liquids and gases is called _______.
a)
convection
b)
radiation
c)
conduction
d)
temperature
72.
All matter is made of _____ that are constanly moving.
a)
insulators
b)
particles
c)
convection
d)
pieces of plastic
73.
If an object has particles that are moving very slowly, the object's temperature is probably ______.
a)
hot
b)
small
c)
cold
d)
big
74.
If an object has particles that are moving very quickly, the object 's temperature is probably _____.
a)
cold
b)
slow
c)
big
d)
hot
75.
The flow of thermal energy from warmer objects to cooler objects is called ______.
a)
heat
b)
movement
c)
friction
d)
energy
76.
To measure the temperature difference between two cups of water, you would use a _____.
a)
measuring cup
b)
ruler
c)
thermometer
d)
balance scale
77.
Sawing a piece of wood causes the end being sawed to become warm.  In this case, heat is produced by ____.
a)
burning fuels
b)
mixing matter
c)
electricity
d)
friction
78.
Which material would NOT make a good baking pan (for high temperatures in the oven)?
a)
aluminum
b)
plastic
c)
steel
d)
glass
79.
Glass, steel, and aluminum are good examples of ______.
a)
insulators
b)
thermal energy
c)
conductors
d)
radiation
80.
Plastic foam, wood, and rubber are good examples of ______.
a)
conductors
b)
insulators
c)
solar energy
d)
convection
81.
On a hot summer day, which shirt would you put on to make sure you stay cool while you are outside playing?
a)
A black shirt because it reflects the sun's energy.
b)
A white shirt because it reflects the sun's energy.
c)
A black shirt because it absorbs the sun's energy.
d)
A white shirt because it absorbs the sun's energy.
82.
When holding a cup of ice water, your warm hand becomes cold. How does the heat transfer?
a)
From the cold cup to your hand
b)
From the cold cup to the warm air
c)
From the ice to your hand
d)
From your warm hand to the cold cup.

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