1. 57 The Conservation of Energy

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3. 57 The Conservation of Energy Key Vocabulary efficiency energy transfer energy transformation Law of Conservation of Energy scientific law

4. 57 The Conservation of Energy Scientific law Scientific law - a general statement about the physical world that is based on empirical observation and evidence.

5. 57 The Conservation of Energy Read the introduction and look for key ideas Energy, light, and sound are released when fireworks explode.

6. 57 The Conservation of Energy What is the guiding principle behind the behavior of energy? Energy, light, and sound are released when fireworks explode.

7. 57 The Conservation of Energy Complete the reading

8. 57 The Conservation of Energy Analysis question 1 Which of the following diagrams accurately applies the Law of Conservation of Energy to a toaster in use? Explain your choice.

9. 57 The Conservation of Energy Analysis question 2 Your friend tells you that a “generator makes electricity.” Do you agree or disagree with her statement? Explain why in terms of the Law of Conservation of Energy.

10. 57 The Conservation of Energy Analysis question 3 Your friend says that when he measured how much electricity was provided by a battery, it was less than the potential energy in the battery. He concluded that the transformation violated the Law of Conservation of Energy. Do you agree? Explain, using the ideas of the Conservation of Energy.

11. 57 The Conservation of Energy SCORING GUIDE: Understanding Concepts

12. 57 The Conservation of Energy Analysis question 4 Which energy is often called the “graveyard of kinetic energy” and why?

13. 57 The Conservation of Energy Analysis question 5 What is the efficiency of an engine that gives off 70% thermal energy?

14. 57 The Conservation of Energy Complete the “After” column for questions 3-5 of Student Sheet 53.1, “Anticipation Guide: Ideas About Energy”

15. 57 The Conservation of Energy What is the guiding principle behind the behavior of energy?

16. 57 The Conservation of Energy Key vocabulary definitions Efficiency - The ratio of useful energy that is released by a process to the total energy absorbed by the process; useful energy released: total energy absorbed. Energy transfer – The transfer of energy from one object to another.

17. 57 The Conservation of Energy Key vocabulary definitions Energy transformation - The change of energy from one type to another, such as from potential to kinetic. Law of Conservation of Energy - The scientific law that states that energy can be transferred or transformed but it cannot be lost or destroyed.

18. 57 The Conservation of Energy Key vocabulary definitions Scientific law - A statement explaining a natural phenomenon that has been proven to occur repeatedly, whenever certain conditions exist. It is also called a natural law.