Name
Date
Class
Content Practice A
LESSON 2
Energy Transformations and Work Directions: On the line before each definition, write the letter of the term that matches it correctly. Some terms will be used more than once.
1. This occurs when energy is converted from one form to another.
2. This is the transfer of energy that occurs when a force makes an object or a particle move.
3. This only occurs while the force is acting on the
A. law of conservation of energy
B. energy transformation
C. work
object.
4. This is the idea that energy can be transformed from one form to another, but it cannot be created or destroyed.
5. When you ride a roller coaster, your gravitational potential energy is transformed to kinetic energy and back to gravitational potential energy.
6. Even though energy can change forms, the total amount of energy in the universe does not change. Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
32
Energy, Work, and Simple Machines
Name
Date
Class
Content Practice B
LESSON 2
Energy Transformations and Work Directions: Circle the term or phrase that correctly completes each sentence.
1. Energy never disappears. It just floats
.
changes form
2. When energy is transferred
, the form of energy might not change. stored
3. Humans and other animals transform the
energy in plants
into other forms of energy for their life processes. chemical
mechanical
4. When you eat broccoli, your body breaks apart the chemical in the molecules that make up the broccoli.
Copyright © Glencoe/McGraw-Hill, a division of The McGraw-Hill Companies, Inc.
energy
bonds
5. Forces are
.
movements
pushes or pulls
6. If you lift a backpack with a force of 20 N, you do
work than
if you lift a backpack with a force of 40 N. less
more
7. If you lift a backpack 1 m, you do
work than if you lift
it 2 m. less
more
8.
is a force between two surfaces that are in contact with each other. Energy
Friction
Energy, Work, and Simple Machines
33
