More Worked Examples, with strategy sections to help students think their way through problems.A new Foundations chapter provides a review of basic topics needed to understand important principles such as classical mechanics and electromagnetism.Chemist's toolkits reminds students of key chemical techniques as they become necessary in the text.Roadmaps of key equations at the end of each chapter summarize the relations between expressions and, where appropriate, indicate the approximations needed to transform an equation into something simpler. Impact sections, about one per chapter, show how the principles are being applied in a variety of modern contexts, especially biology and materials science.More Brief illustrations of how to use equations, most followed with a Self-test. let students assess their grasp of the calculation or topic.A new Resource section consolidates material on symbols and units and the Data section.