Such laws assert that some quantity is conserved, which means that the quantity remains constant even when particles or bodies suffer drastic changes involving motions, collisions, and reactions. Onservation laws play an important role in physics. ? For a complex, curving descent, how can the final speed be determined in a simple way? (Example 8, page 222 and Checkup 7.4, question 1, page 224) 204 ? As a roller-coaster car travels up to a peak, over it, and then down again, does gravity do work? Does the normal force? (Checkup 7.1, question 1, page 210) ? What is the work done by gravity when the roller-coaster car descends along an incline? (Example 3, page 209) To see how energy considerations provide powerful approaches for understanding and predicting motion, we will ask: We will see that gravity does work on the roller-coaster car while it descends, increasing its kinetic energy. The high-speed and high-acceleration thrills of a roller coaster are made possible by the force of gravity. Norton & Company stands as the largest and oldest publishing house owned wholly by its employees. In the 1950s, the Norton family transferred control of the company to its employees, and today-with a staff of four hundred and a comparable number of trade, college, and professional titles published each year-W. By mid-century, the two major pillars of Norton’s publishing program-trade books and college texts- were firmly established. The Nortons soon expanded their program beyond the Institute, publishing books by celebrated academics from America and abroad. Herter Norton first published lectures delivered at the People’s Institute, the adult education division of New York City’s Cooper Union. Norton & Company has been independent since its founding in 1923, when William Warder Norton and Mary D.
Norton & Company Ltd., Castle House, 75/76 Wells Street, London W1T 3QT 1234567890 W. Norton & Company, Inc., 500 Fifth Avenue, New York, N.Y. Cover Design: Joan Greenfield Library of Congress Cataloging-in-Publication Data has been applied for. Cover Illustration: John Belcher, inter alia. Mickey Book designer: Sandy Watanabe Layout artist: Paul Lacy Illustration Studio: JB Woolsey Arts, Inc. Lange Director of Manufacturing-College: Roy Tedoff Senior Project Editor: Christopher Granville Photo Researcher: Kelly Mitchell Editorial Assistant: Lisa Rand, Sarah L. All rights reserved Printed in the United States of America Third Edition Composition: Techbooks Manufacturing: RR Donnelley & Sons Company Editor: Leo A. Markert, a printer by trade to Christiana Park, for her thirst for new knowledge and to Erin, Ryan, Sean, and Gwen, for their wonder and clarity.-J.T.M.Ĭopyright © 2007 by W.W. To Susan Ohanian, writer, who gently tried to teach me some of her craft.-H.C.O.
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