Free Printable Energy Test A

1.

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.

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.

The Law of the Conservation of Energy states -

a)

Energy can be created, just not destroyed. It changes its form from one type to another.

b)

Energy can never be created nor destroyed. It can only change its form from one type to another.

c)

The total energy in our Universe changes, as different forms of energies can be transformed from each other under certain circumstances.

d)

Energy transformations do not passively occur in our lives, rather we actively make use of energies and transform energies.

4.

Which energy transformation occurs in a toaster?

a)

chemical to electric

b)

electric to thermal (heat)

c)

kinetic to chemical

d)

thermal to potential

5.

A computer works by transforming electrical energy into what other kinds of energy?

a)

Light, heat, kinetic energy, and sound

b)

Thermal, chemical, and potential

c)

Sound, kinetic, and electrical

d)

Light, chemical, and potential

6.

A car transforms the __________energy from the gasoline to __________energy of motion.

a)

heat; electrical

b)

nuclear; kinetic

c)

kinetic; potential

d)

chemical; kinetic

7.

A block of ice slides down a hill (neglect friction and air resistance). It has 75 J of kinetic energy at the bottom of the hill. What is the potential energy when the kinetic energy is 50 J. ?

a)

0 J

b)

25 J

c)

50 J

d)

75 J

8.

A bead slides along a friction-free wire. Where is the kinetic energy the greatest?

a)

A (top hill)

b)

B (partway down hill)

c)

C (bottom of hill)

d)

D (partway up the hill)

9.

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

a)

Location W

b)

Location X

c)

Location Y

d)

It's the same kinetic energy everywhere

10.

Where does the pendulum have the most amount of potential energy?

a)

A

b)

B

c)

C

d)

D

11.

Where is kinetic energy at its maximum?

a)

a

b)

b

c)

c

d)

d

12.

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.

13.

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

14.

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)

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

15.

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)

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

16.

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)

Joe since it took him just 2 seconds.

b)

Moe, since he did the work for a longer time.

c)

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

d)

They did the same work, just Moe used more power.

17.

A boy of mass 50 kg jumps to a height of 0.5 m. His potential energy at the highest point is(g = 10 m/s²)

a)

$PE=mgh=50\times10\times0.5=250\ Joules$

b)

$PE=mgh=50\times10\times0.5=250\ Watts$

c)

$W=Fd=50\times0.5=25\ J$

d)

$P=\frac{W}{t}=\frac{50}{0.5}=25\ Watts$

18.

A 4-kg ball is traveling at 5 m/s. Which of the following is the correct calculation for its kinetic energy?

a)

$KE\ =\ \frac{1}{2}mv^2=\frac{1}{2}\cdot5\cdot4^2=40\ J$

b)

$KE\ =\ \frac{1}{2}mv^2=\frac{1}{2}\cdot4\cdot5^2=50\ J$

c)

$KE\ =\ \frac{1}{2}mv^2=\frac{1}{2}\cdot4\cdot5^2=100\ J$

d)

$PE\ =\ mgh\ =\ 4\cdot10\cdot5=200\ J$

19.

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.

20.

How much more distance will a car need to stop if it travels 3 times faster? Assume frictional forces are the same.

a)

$\frac{1}{3}\ as\ much$

since KE is inversely proportional to velocity

b)

3 times as much since KE is proprotional to velocity and work= energy energy change

c)

$3^2=6$

So 6 times as much

d)

$3^2=9$

So 9 times as much since KE is directly proportional to velocity squared and work = energy change.

Energy Test A

Total questions: 20

Worksheet time: 29mins

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