57 The Conservation of Energy

LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the SEPUP course to customize the unit to match their students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of SEPUP within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size. DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of SEPUP or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis. Copyright © 2015 The Regents of the University of California. All rights reserved. Header photo: Sam Howzit | Flickr Creative Commons Slide Design: Shaun Wegscheid | Fonts: Arial, Kalinga Title slide photo: Jean Scheijen | FreeImages.com

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

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

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

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

57 The Conservation of Energy Complete the reading

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.

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.

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.

57 The Conservation of Energy SCORING GUIDE: Understanding Concepts

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

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

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

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

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.

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.

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.