CK-12 Online Textbook Sections on Energy, Work, and Simple Machines
13.0 Work and Machines Describes simple and compound machines, including types of machines, work, efficiency, and mechanical advantage 14.0 Introduction to Energy Introduction to types and characteristics of energy - its forms, conservation laws, and the available energy resources. Simple Circuits - on CK12 YELLOW BOOK (7th Grade Science Textbook in classroom) - online chapters as pdf files. CHAPTER 13 PDF FILES CORRELATE WITH CHAPTER D4 IN YELLOW CLASSROOM TEXTBOOKS Chapter 4 / Chapter 13: Work and Energy - PowerPoint 4.1 / 13.1 Work is the use of force to move an object 4.2 / 13.2 Energy is transferred when work is done 5.1 / 14.1 Machines help people do work 5.2 / 14.2 Six simple machines have many uses Simple Circuits - on CK12
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