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Work Power and Energy Mixed Practice

Total questions: 48

Worksheet time: 54mins

Name
Class
Date
1.

The ability to do work

a)

Power

b)

Force

c)

Energy

d)

Motion

2.

Combines all of the kinetic and potential energy in a system

a)

Mechanical Energy

b)

Mechanical Advantage

c)

Power

d)

Work

3.

This requires a force that causes motion

a)

Work

b)

Energy

c)

Inertia

d)

Gravity

4.

Mark the two things that affect gravitational potential energy

a)

Mass

b)

Weight

c)

Height (distance)

d)

Power

5.

If a piece of wood contains 500 joules of chemical potential energy, how many joules of light and thermal energy can it produce when it is burned?

a)

100 joules

b)

500 joules

c)

1000 joules

d)

0 joules

6.

The rate of work or how fast work gets done

a)

Power

b)

Force

c)

Energy

d)

Inertia

7.
The faster an object moves, the ________ kinetic energy it has. 
a)
more
b)
less
c)
none of the above
d)
all of the above 
8.

What two factors affect an object's kinetic energy?

a)

area and volume

b)

mass and weight

c)

weight and height

d)

mass and speed

9.

Increasing an object's mass will increase its kinetic energy.

a)

true

b)

false

10.

Increasing an object's speed will increase its kinetic energy.

a)

false

b)

true

11.
As the velocity of an object decreases its KE will...
a)
increase
b)
decrease
c)
stay the same
12.
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 
13.

What is the correct unit for energy?

a)

meters (m)

b)

kilogram meters per second (kg m/s)

c)

Newtons (N)

d)

Joules (J)

14.

Lilly's cat ran through your yard. The cat has a mass of 5 kg. He is running at a speed of 3 m/s. What is the kinetic energy of the cat as he runs? (KE = 1/2mv2)

a)

8.5 J

b)

45 J

c)

7.5 J

d)

22.5 J

15.

Alice kicks a soccer ball with a mass of 2.1 kg. The ball leaves the ground moving 30 meters per second. What is the kinetic energy of the soccer ball? (KE = 1/2mv2)

a)

567 J

b)

900 J

c)

945 J

d)

30 J

16.

If the 1.2 kg basketball rolls at 3 m/s, what is it's kinetic energy? (KE = 1/2mv2)

a)

2.7

b)

5.4

c)

3.6

d)

9

17.

what is the unit of work?

a)

Newton

b)

Joule

c)

Watt

d)

meter

18.
What is the formula for work?
a)
Force = work x distance
b)
Distance = force x work
c)
Work = force x distance
d)
Work = force x mass
19.

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

20.

Newtons are the unit for _____________.

a)

Work

b)

Distance

c)

Acceleration

d)

Force

21.
Which one is a unit of distance?
a)
meter (m)
b)
gram (g)
c)
liter (L)
d)
Joule (J)
22.
At which point(s) on the roller coaster is the gravitational potential energy at its maximum?
a)
A
b)
B
c)
C
d)
D
23.
What is the difference between calculating power and work?
a)
Power takes into account the time it takes to complete a task
b)
Work takes into account the time it takes to complete a task
c)
Power is force/area
d)
Work is force/area
24.
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 
25.
If an object moves from a high place to a lower place, will it gain or lose potential energy?
a)
lose
b)
gain
c)
neither
d)
both
26.

Bobby lifts a book to the second floor in 20 seconds. Carol lifts the same book to the second floor in 10 seconds. Who did more work?

a)

Bobby

b)

Carol

c)

They did the same amount of work

d)

Not enough information

27.

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

28.

Water stored in a dam possesses

a)

(a) no energy

b)

(b) electrical energy

c)

(c) kinetic energy

d)

(d) potential energy

29.

If 150 Joules of work is needed to move a box 10 meters, how much force was used? 

a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
30.
You do 90 joules of work in 30 seconds. How much power have you generated?
a)
30 watts
b)
3 watts
c)
120 watts
d)
270 watts
31.

50 J of work is done lifting a 20.0 N book in the air. How high was it lifted?

a)

2.5 m

b)

3.5 m

c)

0.4 m

d)

25 m

32.
If 150 Joules of work is needed to move a box 10 meters, what force was used? 
a)
1500 N
b)
15 N
c)
1.5 N
d)
150 N
33.

Two workers use 100 N of force to move a sofa 2 meters in 2 seconds. How much power is required?

a)

100 watts

b)

400 watts

c)

104 watts

d)

50 watts

34.
The law of conservation of energy states that when one form of energy is converted into another,
a)
energy is destroyed in the process
b)
no energy is destroyed in the process
c)
energy is created in the process
d)
some amount of energy cannot be accounted for
35.
In energy transformations, "wasted energy" usually takes what form?
a)
heat
b)
chemical energy
c)
light
d)
sound waves
36.

When is energy lost?

a)

During transformations only

b)

During transformations and transfers

c)

During transfers only

d)

During GPS outages

37.

A kettle uses 100J of electrical energy to produce 7J of sound energy and 93J of thermal energy. How efficient is the kettle?

a)

100%

b)

7%

c)

93%

d)

95%

38.

A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?

a)

5%

b)

50%

c)

55%

d)

100%

39.

What best describes potential energy?

a)

The energy that an object has because of its motion

b)

The energy stored in an object

c)

The energy released when an object is heated

40.

What best describes gravitational potential energy?

a)

The energy an object has due to its position

b)

The energy an object has due to the moon

c)

The energy an object has due to falling.

41.

An object is traveling with a total kinetic energy of 500 joules. It starts to go uphill. On the way up the hill, it gains 200 joules of potential energy.

How much total energy does it have?

a)

500j

b)

700j

c)

300j

d)

100000j

42.

An object is traveling with a total kinetic energy of 500 joules. It starts to go uphill. On the way up the hill, it gains 200 joules of potential energy.

Where did the 200 joules of potential come from?

a)

It was created by gravity as it went up the hill.

b)

It was transformed from kinetic energy as it went up the hill.

c)

It was stored in the hill when the object got there.

43.

An object is traveling with a total kinetic energy of 500 joules. It starts to go uphill. On the way up the hill, it gains 200 joules of potential energy.

How much kinetic energy does it have?

a)

500j

b)

200j

c)

700j

d)

300j

44.
What energy transformations take place when a battery-operated radio is in use?
a)
Electrical to chemical to light
b)
Sound to chemical to mechanical
c)
Chemical to electrical to sound
d)
Light to electrical to thermal
45.
What kind of energy is represented in this picture?
a)
Thermal
b)
Potential
c)
Nuclear
d)
Mechanical
46.
What kind of energy is represented in the picture?
a)
Thermal
b)
Chemical
c)
Sound
d)
Nuclear
47.

When a car burns gasoline it creates hot air to move the pistons in the engine, which causes the car to move. What energy transformation occur from the fuel to the movement of a car?

a)

thermal energy to mechanical energy

b)

thermal energy to chemical energy to mechanical energy

c)

chemical energy to thermal energy to mechanical energy

d)

chemical energy to electrical energy

48.
An example of work is holding a heavy bag.
a)
True
b)
false

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