1. Energy 3.1 Energy exists in different forms. 3.2
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Energy
the BIG idea
Energy has different forms, but it is always conserved.
3.1
Energy exists in different forms.
3.2
Energy can change forms but is never lost.
3.3
Technology improves the ways people use energy.
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2. Energy exists in different forms.
3.1
Energy exists in different forms.
• Energy is the ability to cause a change.
• Different forms of energy produce changes in different ways.
energy
kinetic energy
• Kinetic energy depends on mass and speed.
potential energy
High Speed
Low Speed
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3. Energy exists in different forms.
3.1
Energy exists in different forms.
• Energy is the ability to cause a change.
• Different forms of energy produce changes in different ways.
energy
kinetic energy
• Kinetic energy depends on mass and speed.
potential energy
• Potential energy depends on position and chemical composition.
CHAPTER
RESOURCES
SECTION
OUTLINE

4. Energy can change forms but is never lost.
3.2
Energy can change forms but is never lost.
• Energy often needs to be transformed in order to produce a useful form of energy.
law of conservation of energy
• The law of conservation of energy states that energy is never created or destroyed.
energy efficiency
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5. Energy can change forms but is never lost.
3.2
Energy can change forms but is never lost.
• Energy often needs to be transformed in order to produce a useful form of energy.
law of conservation of energy
• The law of conservation of energy states that energy is never created or destroyed.
energy efficiency
• Energy can be transformed in many different ways, including from potential energy (PE) to kinetic energy (KE) and back again. PE PE KE
VISUALIZATION
Investigate the relationship between potential energy and kinetic energy.
CHAPTER
RESOURCES PE KE
SECTION
OUTLINE

6. Technology improves the ways people use energy.
3.3
Technology improves the ways people use energy.
• Different forms of technology are being developed and used to improve the efficiency of energy conversions.
solar cell
• Solar cells convert sunlight into electrical energy.
• New solar cells convert light into electrical energy more efficiently than those in the past
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7. Technology improves the ways people use energy.
3.3
Technology improves the ways people use energy.
• Different forms of technology are being developed and used to improve the efficiency of energy conversions.
solar cell
• Solar cells convert sunlight into electrical energy.
• New solar cells convert light into electrical energy more efficiently than those in the past
VISUALIZATION
Observe how solar cells produce electricity.
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RESOURCES
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OUTLINE

8. 3.1 Energy exists in different forms.
I. Energy exists in different forms.
energy
A. Different forms of energy have different uses.
kinetic energy
1. Energy
potential energy
2. Forms of Energy
B. Kinetic energy and potential energy are the two general types of energy.
1. Kinetic Energy
2. Potential Energy
CHAPTER
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KEY CONCEPT
SUMMARY

9. Energy can change forms but is never lost.
3.2
Energy can change forms but is never lost.
II. Energy can change forms but is never lost.
law of conservation of energy
A. Energy changes forms.
1. Conversions Between Potential Energy and Kinetic Energy
energy efficiency
2. Using Energy Conversions
B. Energy is always conserved.
C. Energy conversions may produce unwanted forms of energy.
CHAPTER
RESOURCES
KEY CONCEPT
SUMMARY

10. Technology improves the ways people use energy.
3.3
Technology improves the ways people use energy.
III. Technology improves the ways people use energy.
solar cell
A. Technology improves energy conversions.
1. Efficient Lights
2. Efficient Cars
B. Technology improves the use of energy resources.
1. Solar Energy
2. Wind Energy
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RESOURCES
KEY CONCEPT
SUMMARY

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