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Name ______________________________________ Date _________
Unit Test AG 77 Grade 5 • Assessment Guide © Houghton Mifflin Harcourt Publishing Company
Unit 5
Forms of Energy Vocabulary and Concepts
Min tapes a piece of string to each of two ping-pong balls. He hangs the balls so that they are close to one another but do not touch. Later, he finds that they have pulled together. They are now touching. What could explain why the two balls are now touching?
They have both lost their charges.
They have gained opposite charges.
They have both gained a positive
charge.
They have both gained a negative
charge.
5.2D
Curtis uses a wool cloth to give a balloon a negative charge. What will happen when he holds the balloon near the wall, and why?
The balloon will stick to the wall
because a negatively charged object is attracted to an uncharged object.
The balloon will stick to the wall
because a negatively charged object is attracted to another negatively charged object.
The balloon will not stick to the wall
because a negatively charged object is repelled by an uncharged object.
The balloon will not stick to the wall
because a negatively charged object is repelled by another negatively charged object.
5.2D
Aisha wanted to know how positive and negative charges affect balloons. The balloons shown below are part of her investigation.
What are the charges on the balloons?
They are both positive.
They are both negative.
They are both uncharged.
One is positive, and one is negative.
5.2D
What form of energy cooks food in a solar cooker?
chemical energy
electrical energy
thermal energy
mechanical energy
5.2A
Some people hang their laundry to dry outside using an alternative source of energy. On which kind of day will the laundry dry fastest?
a cold, rainy day
a cold, cloudy day
a warm, sunny day
a warm, cloudy day
5.6A, 5.7C
Unit Test
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Name ______________________________________ Date _________
Unit Test AG 78 Grade 5 • Assessment Guide © Houghton Mifflin Harcourt Publishing Company
Unit 5
An electron is the particle most easily removed from an atom.
What is the electric charge of a neutral atom from which an electron has been removed?
negative
neutral
nucleus
positive
5.3A
A material that allows an electric current to flow through it is an electrical conductor. A material through which an electric current cannot flow easily is called an insulator. Which statement best describes the difference between an insulator and a conductor?
An insulator has a static charge, and a
conductor does not.
A conductor contains more electrons
than an insulator.
A conductor is a metal, and an
insulator is any material that is not a metal.
An insulator does not have electrons
that are free to move, and a conductor does.
5.5A
In a three-pronged plug, one flat prong carries current from the supply that enters the electrical outlet, and the other returns the current to the service panel of the building. The round prong helps protect people from electrical shocks.
What has a purpose similar to that of the round prong?
a magnet
a generator
a lightning rod
an electrical outlet 5.6A
Why do two socks sometimes stick together in a dryer?
Both socks have a positive charge.
Both socks have a negative charge.
Protons move from one sock to
another.
Electrons move from one sock to
another. 5.2D
An electric clock in a classroom will not keep time if it is not plugged into an electrical outlet. What does the clock get from the electric current from the outlet?
batteries
chemicals
energy
time of day
5.6A
Name ______________________________________ Date _________
Unit Test AG 79 Grade 5 • Assessment Guide © Houghton Mifflin Harcourt Publishing Company
Unit 5
Which energy transformation occurs when an electrical fan is turned on?
heat energy into motion energy
electrical energy into thermal energy
energy of motion into sound energy
electrical energy into energy of
motion
5.6A
You use energy transformations every day. Which of these is a way that you would use the transformation of electrical energy into motion energy?
watching your favorite show on
television
taking an elevator to the top of a tall
building
listening to your MP3 player while
you walk to school
turning on the lamp on your desk so
you can see to do your homework
5.6A
Darrell made toast for breakfast by putting a slice of bread into the toaster and turning the toaster on. Which energy transformation did he use to make a piece of toast?
heat energy into electrical energy
electrical energy into heat energy
light energy into electrical energy
electrical energy into light energy
5.6A
Objects can lose energy. Which answer describes an example of the energy of a material decreasing?
eggs cooking in a pan
water freezing into ice
snow melting in the spring
a ball bouncing on the floor
5.6A
The picture below shows a book sitting on a shelf.
Which type of energy does the book have because it is on the shelf?
chemical
electrical
kinetic
potential
5.6A
Name ______________________________________ Date _________
Unit Test AG 80 Grade 5 • Assessment Guide © Houghton Mifflin Harcourt Publishing Company
Unit 5
Electric companies send electric power through an electric power grid to your home. The illustration below shows some of the parts of an electric power grid.
At which part of this grid is electrical energy produced from other forms of energy?
substation
distribution line
transmission lines
generating station
5.6A
Suppose someone caused the book to fall from the shelf to the ground.
Compared to the total sum of kinetic and potential energy the book has while on the shelf, about how much would it have when it is halfway from the shelf to the ground?
no energy
half as much
twice as much
the same amount
5.6A
The picture below shows a spring toy. If you push down the toy and then release it, the toy would pop up through the air.
Which types of energy does the spring toy have as it flies through the air?
electrical and thermal
kinetic and potential
potential and electrical
thermal and kinetic
5.6A
