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Unit 7 Review: Work, Power, Energy

Total questions: 50

Worksheet time: 4hrs 36mins

Name
Class
Date
1.
Which of the following IS NOT an example of work being done?
a)
Pushing a cart in a store
b)
Shooting a basketball
c)
A stand off in tug of war
d)
Running a mile
2.
If a boulder is lifted by a forklift a distance of 10 meters with a force of 30 Newtons. How much work is being done?
a)
.333 Joules
b)
3 Joules
c)
300 Joules
d)
60 Joules
3.
The unit used to measure work is the 
a)
Watt
b)
Newton
c)
Joule
d)
meter
4.
The unit used to measure power is the 
a)
Watt
b)
Newton
c)
Joule
d)
Newton*meter
5.
In which scenario is more power being generated?
a)
Man throws ball with 20 N force 3 m in 10 seconds
b)
Man throws ball with 20 N Force 5 meters in 10 seconds
6.
Energy due to motion is ____________ energy. 
a)
Potential 
b)
Energy
c)
Kinetic
d)
Friction
7.
A rabbit of mass 3kg walks at a speed of 0.5m/s. Calculate its kinetic energy.
a)
0.5 J
b)
0.75 J
c)
0.255 J
d)
0.375 J
8.
When a pendulum swings, at which point is kinetic energy highest: 
a)
1
b)
2
c)
3
d)
4
9.

Calculate the potential energy of a car with a mass of 2,500 kg that is on a hill 100 meters above sea level.

a)

250,000 J

b)

2,450,000 J

c)

2,451,663 J

d)

248 J

10.

A 250 kg island is floating 20 meters in the air. How much potential energy does the island have?

a)

49,000 J

b)

5,000 J

c)

0.98 J

d)

509.68 J

11.

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?

a)

567 J

b)

900 J

c)

945 J

d)

30 J

12.
Energy can be _____________ or changed from one type to another.
a)
destroyed
b)
transferred
c)
created
d)
ignored
13.
What states that energy can never be created or destroyed?
a)
law of conservation of momentum
b)
law of conservation of energy
c)
law of conservation of matter
d)
law of conservation of water
14.
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?
a)
21661.53 m/s
b)
147.17 m/s
c)
22880.0 km/s
d)
10830.76 m/s
15.
An object has 64 J of kinetic,134 J of potential, then it will have _____ of mechanical energy.
a)
8,576 J
b)
189 J 
c)
70J
d)
198 J 
16.
A bike rider approaches a hill at a speed of 5.5 m/s. The combined mass of the bike and rider is 87kg. Find the initial kinetic energy of the system. 
The rider coasts up the hill. Ignoring friction, at what height will the bike come to rest?
a)
1316J, 1.5m
b)
2316J, 2.5m
c)
1457J, 3.5m
d)
none of the above
17.

Energy lets us do work and is required to make anything happen. Energy is not a substance that you can see or touch but we can observe it effects. Energy is measured in _________.

a)

Watts

b)

Pascals

c)

Joules

d)

Amps

18.

Energy exists in many forms and it can be transformed from one form to another. However it can not be ________ or ____________.

a)

chemical or physical

b)

potential or sound

c)

eaten or felt

d)

created or destroyed

19.

Energy stored in objects due to their height above the ground is called?

a)

Chemical Potential Energy

b)

Heat Energy

c)

Gravitational Potential Energy

d)

Light Energy

20.

This type of energy is stored in the bonds between atoms and if found in food and petrol.

a)

Chemical potential energy

b)

Heat energy

c)

Gravitational potential energy

d)

Electrical energy

21.

This type of energy is found in electromagnetic waves like microwaves, X-rays and visible light.

a)

Sound energy

b)

Heat energy

c)

Light energy

d)

Chemical potential energy

22.

When a car drives up a hill and stops at the top, what is the main energy transformation taking place?

a)

chemical potential energy to heat energy

b)

kinetic energy to gravitational potential energy

c)

gravitational potential energy to chemical potential energy

d)

chemical potential energy to sound energy

23.

In most situations when an object is moving some energy is lost as friction causes some energy to be converted into ________ and _______.

a)

heat and light

b)

heat and sound

c)

sound and light

d)

electricity and heat

24.

Work is done on an object when energy is transferred to that object. The amount of work done depends on the force applied to that object and the distance the object travels. Work is measure in _____________.

a)

Watts

b)

Metres

c)

Pascals

d)

Joules

25.

The rate at which work is done is called power (P). This means a powerful machine will do a lot of work in a short period of time. Power is measured in __________.

a)

Watts

b)

Joules

c)

Pascals

d)

Metres

26.

The 'g' in PE = mgh stands for

a)

greater

b)

graphite

c)

grams

d)

gravity

27.

The amount of matter inside an object?

a)

weight

b)

atomic number

c)

mass

d)

gravity

28.

The force exerted on a mass by gravity is called _________.

a)

weight

b)

atomic number

c)

mass

d)

gravity

29.
Energy of a rock perched on a cliff is an example of...
a)
gravitational
b)
elastic
c)
chemical
d)
kinetic
30.
How do you calculate power?
a)
P = W/t
b)
P = E/t
c)
P = w * t
d)
P = bbq/chicken
31.
How do we calculate work?
a)
W = F * d
b)
w = f * D
c)
W = F * D
d)
w = f * d
32.
How much work is being done with 200 N of force over 426 meters?
a)
85,200 J
b)
45,620 J
c)
90,480 J
d)
62,329 J
33.
The SI unit of work is?
a)
Joules
b)
Watts
c)
Newtons
d)
meters
34.
The energy of movement is...? 
a)
Kinetic
b)
Potential
35.
Energy that is stored is called...
a)
Kinetic
b)
Potential 
36.
What is the formula for Kinetic Energy?
a)
PE = m*g*h
b)
KE = 1/2m*v2
c)
W = F*d
d)
P = W/t
37.
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 
38.
What is the formula for calculating the total amount of mechanical energy?
a)
ME = KE + PE
b)
KE = ME + PE
c)
PE = KE + ME
d)
ME = 1/2 mv2
39.

A roller coaster whose average speed is 32 m/s is at the top of a 72m hill and weighs 966N. At the top of the hill the coaster car has ___________________ energy.

a)

only kinetic energy

b)

only potential energy

c)

mostly kinetic energy

d)

both kinetic and potential energy

40.

What is the potential energy of a 3kg ball that is on the ground?

a)

0 J

b)

3 J

c)

9.8 J

d)

29.4 J

41.

If the mass of the cart is 15kg, how much is the potential energy of the cart?

a)

0J

b)

1.2J

c)

6J

d)

58.8J

42.

If the mass of the cart is 8.12kg, what is the kinetic energy of the cart?

a)

0J

b)

1.2J

c)

6J

d)

58.8J

43.

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

44.

What is the total mechanical energy of the object?

a)

100J

b)

75J

c)

50J

d)

25J

45.
The metric unit of a joule (J) is a unit of
a)
potential energy.
b)
work
c)
kinetic energy
d)
all of the above
46.
Power is
a)
the rate at which energy is expended.
b)
work per unit of time.
c)
the rate at which work is done.
d)
any of the above.
47.
Calculate the power of a 75 kg person climbing a 3.2 meter set of stairs in 5.8 seconds.
a)
240 W
b)
2400 W
c)
414 W
d)
1200 W
48.
Calculate the work done by a 75 kg person climbing a 3.2 meter set of stairs. 
a)
240 J
b)
2400 J
c)
23.4 J
d)
1200 J
49.
An elevator must lift 1000 kg a vertical distance of 100 m. How much work does the elevator do?
a)
1,000 J
b)
10,000 J
c)
100,000 J
d)
1,000,000 J
50.
An elevator must lift 1000 kg a vertical distance of 100 m. What is the Horsepower of the elevator if it does this in 0.5 minutes?
a)
128 HP
b)
243 HP
c)
310 HP
d)
446 HP

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