Free Printable ENERGY REVIEW

1.

"Energy can be transformed from one form into another or transformed from one region or another, but energy cannot be created or destroyed."

Which law is this?

a)

Law of Conservation of Mass

b)

Newton's Second Law

c)

Law of Conservation of Energy

d)

Law of Conservation of Momentum

2.

______and _____ are the only two sources that produce all the energy on Earth. They both use _______energy.

a)

Sun; Core of Earth; chemical

b)

Core of Earth; Nuclear power plant; Solar

c)

Core of the Earth; sun; kinetic energy

d)

Sun; Core of Earth; Nuclear

3.

Power is ___________

a)

is the rate of energy transfer.

b)

how fast work done.

c)

all other statements are correct

d)

is the rate that work is done.

4.

A pendulum is given potential energy by being pulled up to location W. At which location does the pendulum have maximum kinetic energy?

a)

Location W

b)

Location X

c)

Location Y

d)

Location Z

5.

Where is kinetic energy at its maximum?

a)

a

b)

b

c)

c

d)

d

6.

If an engineer designs the first hill of a coaster so that it is taller, then

a)

there will be more potential energy at the top of the first hill.

b)

there will be more kinetic energy at the bottom of the first hill.

c)

there will be a greater velocity at the bottom of the first hill.

d)

it will take more work to get it to the top of the first hill

e)

all the other statements are correct.

7.

You move a 10-newton weight two meters in 4 seconds. Which shows the correct calculation of how much work you have done on the weight?

a)

$W=Fd=10\times4=40\ Watts$

b)

$W=\frac{F}{d}=\frac{10}{2}=5\ Joules$

c)

$W=Fd=10\times2=20\ Joules$

d)

$W=Fd=\frac{10}{2}=5\ Joules$

8.

You do 90 joules of work in 30 seconds. How much power have you generated?

a)

$PE=mgh=90\times10\times30\ =2700\ Watts$

b)

$P=\frac{W}{t}=\frac{90}{30}=3\ Watts$

c)

$P=\frac{W}{t}=\frac{90}{30}=0.33\ Joules$

d)

$P=Wt=\frac{90}{30}=60\ Watts$

9.

Joe moves an 8-N weight 5 meters in 2 seconds. Moe moves an 8-N weight 5 m in 4 seconds. Who did the most work on the weight?

a)

Both statements indicating same work are correct.

b)

They did the same work; Joe used more power.

c)

They did the same work, but Joe did the work faster.

d)

Neither statement indicating same work is correct since Joe did more work.

10.

If it takes $5\ x\ 10^7Joules$ of work by chain to get a rollercoaster to the top of the first hill, how much potential energy does it have at the top of the first hill?

a)

$5\times10^7Joules$

b)

$5\times10^7Watts$

c)

50,000 Joules

d)

500,000 Watts

11.

A rollercoaster goes down a hill. Which statement about a rollercoaster going down a hill is incorrect?

a)

the kinetic energy of the coaster increases

b)

the potential energy of the coaster increases

c)

the momentum of the coaster increases

d)

the speed of the coaster increases

12.

A 2-kg ball is traveling at 5 m/s. Which of the following is the correct calculation for its kinetic energy?

a)

$KE\ =\ \frac{1}{2}mv^2=\frac{1}{2}\cdot5\cdot2^2=10\ J$

b)

$KE\ =\ \frac{1}{2}mv^2=\frac{1}{2}\cdot2\cdot5^2=50\ J$

c)

$KE\ =\ \frac{1}{2}mv^2=\frac{1}{2}\cdot2\cdot5^2=25\ J$

d)

$PE\ =\ mgh\ =\ 2\cdot10\cdot5=100\ J$

13.

A ball traveling 20 m/s has kinetic energy. How much will its KE change by if it travels at 40 m/s?

a)

$\frac{1}{2}\ as\ much$ since KE is inversely proportional to velocity

b)

2 times as much since KE is directly proportional to velocity

c)

4 times as much since KE is directly proportional to the square of velocity $2^2=4$

d)

20 times as much since 40-20 = 20.

14.

A pendulum is swinging as shown. When the PE is 2 J, what is the KE? Ignore heat loss due to friction.

a)

2 J

b)

8 J

c)

10 J

d)

12 J

15.

A bead slides along a friction-free wire. Where is the potential energy of the bead the same?

a)

A and C

b)

B and D

c)

C and D

d)

There are not 2 locations where PE is same

16.

The electric motor on a fan transforms ___________ energy into ___________energy.

a)

electrical; kinetic

b)

chemical; kinetic

c)

kinetic; electrical

d)

light; potential

17.

The electric motor on a blender transforms ___________ energy into ___________energy.

a)

electrical; kinetic

b)

chemical; kinetic

c)

kinetic; electrical

d)

light; potential

18.

Which of the following is an example of kinetic energy?

a)

A rock at the top of a hill.

b)

Water falling down a waterfall.

c)

A pencil sitting on a desk.

d)

A backpack on the ground.

19.

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 kinetic to heat

c)

mechanical to chemical to sound

d)

chemical to sound to electrical

20.

An electric oven transforms electrical energy into

a)

Heat

b)

electrical

c)

chemical

d)

nuclear

ENERGY REVIEW

Total questions: 20

Worksheet time: 15mins

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