• In response to suggestions by students and instructors, we have clarified our discussions of many topics, including units used to describe angles, friction in threads. the principle of work and energy, principal moments of inertia, and orbital mechanics.
  
• We have added many new examples, continuing our use of the Strategy/Solution/Critical Thinking structure.
  
• To supplement our coverage, we invited Professor Kenneth M. Liechti of the University of Texas at Austin to contribute a discussion of modern developments in dry friction in Chapter 9.
  
• Thirty percent of the problems have been revised or replaced. Problems that are relatively lengthier or more
  

• Each section of the book now begins with "Questions to Consider," intended to encourage interest and curiosity in readers. Among the things addressed in the questions are what students should be looking for as they begin reading the section. How do the concepts to be described relate to the reader's own experience, and what everyday words and concepts are related to technical terms that will be introduced?
  
• The appearance of the books has been updated, with new chapter openers, many new photographs in the text, examples, and problems, and the use of more prominent headings to make reading easier. The colors used have been analyzed and extensively revised from the standpoint of visual clarity.
  
• The text and figures have been revised to address issues related to diversity, equity, and inclusion. The results of
  

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