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This nonfiction text defines forces and motion, and explains the impact these things have on our lives, how gravity affects us, and how the skills and knowledge of scientists such as Isaac Newton have helped us in the development of machinery. An introduction discusses what the reader will learn and explains the feature boxes that are printed in blue and interspersed throughout the text. The "Did You Know?" boxes contain interesting facts, "Test Yourself" has questions about what was read, "Investigate" has experiments that can be done at home, and "Time Travel" tells of discoveries from the past and developments which may affect science in the future. Words that are highlighted in bold print throughout the text are found in the glossary. An index and answers to the "Test Yourself" and "Investigate" features are included. Numerous photographs, charts, graphs, timelines and other illustrations help clarify concepts. In a chapter on the force of friction, practical examples such as spiked sneakers on an athlete and skates on an ice skater help bring relevancy to the explanation. This text in the "Fundamental Physics Series" is a good reference for the study of forces and motion.