1. the BIG idea Energy CHAPTER Energy has different forms, but it is always conserved. Energy exists in different forms. 3.1 Energy can change forms but is never lost. 3.2 Technology improves the ways people use energy. 3.3 CHAPTER OUTLINE NEW CHAPTER CHAPTER RESOURCES

2. VOCABULARY KEY CONCEPT CHAPTER HOME Energy exists in different forms. 3.1 SECTION OUTLINE SECTION OUTLINE kinetic energy energy potential energy Energy is the ability to cause a change. Different forms of energy produce changes in different ways. Kinetic energy depends on mass and speed. High Speed Low Speed CHAPTER RESOURCES CHAPTER RESOURCES

3. VOCABULARY KEY CONCEPT CHAPTER HOME Energy exists in different forms. 3.1 SECTION OUTLINE SECTION OUTLINE kinetic energy energy potential energy Potential energy depends on position and chemical composition. Energy is the ability to cause a change. Different forms of energy produce changes in different ways. Kinetic energy depends on mass and speed. CHAPTER RESOURCES CHAPTER RESOURCES

4. VOCABULARY KEY CONCEPT CHAPTER HOME energy 3.1 KEY CONCEPT SUMMARY KEY CONCEPT SUMMARY Energy exists in different forms. The ability to do work or to cause a change. For example, the energy of a moving bowling ball knocks over pins; energy from food allows animals to move and to grow; and energy from the Sun heats Earth’s surface and atmosphere, which causes air to move. kinetic energy energy potential energy CHAPTER RESOURCES CHAPTER RESOURCES

5. VOCABULARY KEY CONCEPT CHAPTER HOME The energy of motion. A moving object has the most kinetic energy at the point where it moves the fastest. kinetic energy 3.1 KEY CONCEPT SUMMARY KEY CONCEPT SUMMARY Energy exists in different forms. kinetic energy energy potential energy CHAPTER RESOURCES CHAPTER RESOURCES

6. VOCABULARY KEY CONCEPT CHAPTER HOME Stored energy; the energy an object has due to its position, molecular arrangement, or chemical composition. potential energy 3.1 KEY CONCEPT SUMMARY KEY CONCEPT SUMMARY Energy exists in different forms. kinetic energy energy potential energy CHAPTER RESOURCES CHAPTER RESOURCES

7. VOCABULARY KEY CONCEPT CHAPTER HOME Types of Energy Mechanical Energy The energy that moves objects. Sound Energy The energy of the vibration of particles. Chemical Energy The stored energy of the chemical composition of matter.

8. VOCABULARY KEY CONCEPT CHAPTER HOME Types of Energy Thermal Energy The energy of the total amount of movement of particles in matter. Electromagnetic Energy The energy transmitted as electromagnetic waves. Nuclear Energy The energy of the nucleus of the atom.

9. VOCABULARY KEY CONCEPT CHAPTER HOME law of conservation of energy Energy can change forms but is never lost. 3.2 SECTION OUTLINE SECTION OUTLINE energy efficiency Energy often needs to be transformed in order to produce a useful form of energy. The law of conservation of energy states that energy is never created or destroyed. CHAPTER RESOURCES CHAPTER RESOURCES

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

11. VOCABULARY KEY CONCEPT CHAPTER HOME A law stating that no matter how energy is transferred or transformed, it continues to exist in one form or another. law of conservation of energy 3.2 KEY CONCEPT SUMMARY KEY CONCEPT SUMMARY Energy can change forms but is never lost. law of conservation of energy energy efficiency CHAPTER RESOURCES CHAPTER RESOURCES

12. VOCABULARY KEY CONCEPT CHAPTER HOME A measurement of usable energy after an energy conversion; the ratio of usable energy to the total energy after an energy conversion. energy efficiency 3.2 KEY CONCEPT SUMMARY KEY CONCEPT SUMMARY Energy can change forms but is never lost. law of conservation of energy energy efficiency CHAPTER RESOURCES CHAPTER RESOURCES

13. VOCABULARY KEY CONCEPT CHAPTER HOME Technology improves the ways people use energy. 3.3 SECTION OUTLINE SECTION OUTLINE solar cell New solar cells convert light into electrical energy more efficiently than those in the past Different forms of technology are being developed and used to improve the efficiency of energy conversions. Solar cells convert sunlight into electrical energy. CHAPTER RESOURCES CHAPTER RESOURCES

14. VOCABULARY KEY CONCEPT CHAPTER HOME Technology improves the ways people use energy. 3.3 SECTION OUTLINE SECTION OUTLINE solar cell VISUALIZATION Observe how solar cells produce electricity. CLASSZONE.COM New solar cells convert light into electrical energy more efficiently than those in the past Different forms of technology are being developed and used to improve the efficiency of energy conversions. Solar cells convert sunlight into electrical energy. CHAPTER RESOURCES CHAPTER RESOURCES

15. VOCABULARY KEY CONCEPT CHAPTER HOME A device that converts the energy of sunlight into electrical energy. solar cell 3.3 KEY CONCEPT SUMMARY KEY CONCEPT SUMMARY Technology improves the ways people use energy. solar cell CHAPTER RESOURCES CHAPTER RESOURCES

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

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

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

19. CHAPTER HOME Image Gallery Click on the icons to see a larger image or animation. VISUALIZATION Investigate the relationship between potential energy and kinetic energy. VISUALIZATION Observe how solar cells produce electricity. CLASSZONE.COM

20. CHAPTER HOME Image Gallery BACK TO IMAGE GALLERY

21. CHAPTER HOME Image Gallery BACK TO IMAGE GALLERY

22. CHAPTER HOME Image Gallery BACK TO IMAGE GALLERY

23. CHAPTER HOME Image Gallery BACK TO IMAGE GALLERY

24. BACK TO CHAPTER Click on the items below to access resources on Standardized Test Practice Practice state standardized tests Math Tutorial Review math concepts Resource Centers Get more information on select science topics Content Review Review key concepts and vocabulary Audio Readings Hear chapter audio readings CLASSZONE.COM Chapter Resources CHAPTER HOME Animations Link to all the McDougal Littell Science animations Review Game Play a fun interactive review game Image Gallery Click here to review chapter images and animations