For my son Tim Love you forever RF Copyright 2012 by Sally M Walker and Roseann Feldmann All rights reserved International copyright secured No part of this book may be reproduced stored in a retrieval system or transmitted in any form or by any means electronic mechanical photocopying recording or otherwise without the prior written permission of Lerner Publishing Group Inc except for the inclusion of brief quotations in an acknowledged review Lerner Publications Company A division of Lerner Publishing Group Inc 241 First Avenue North Minneapolis MN 55401 USA For reading levels and more information look up this title at www lernerbooks com Library of Congress Cataloging-in-Publication Data Put inclined planes to the test by Sally M Walker and Roseann Feldmann p cm Searchlight books How do simple machines work Includes index ISBN 978 0 7613 5324 9 lib bdg alk paper ISBN 978 0 7613 8006 1 eb pdf 1 Inclined planes Juvenile literature I Feldmann Roseann II Title Walker Sally M TJ147 W345 2012 621 8 dc22 Manufactured in the United States of America 2-42253-10914-5 24 2016 2009032228
contents Chapter 1 Chapter 2 WoRk page 4 MacHIneS page 10 WHaT IS an Chapter 3 IncLIneD PLane page 14 GRavITy anD FRIcTIon page 24 Chapter 4 IncLIneD PLaneS aRe eveRyWHeRe page 34 Chapter 5 Learn More about Simple Machines 39 Glossary 38 Index 40
chapter 1 WoRk You work every day You work when you walk up the stairs Walking up the stairs is work What are other examples of work 4
You work when you climb a ladder It may surprise you to learn that playing is work too Playing baseball is work 5
