Put Levers to the Test

Put Levers to the Test — page 1 — For my husband Ron 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 U S A Website address www lernerbooks com Library of Congress Cataloging-in-Publication Data Put levers 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 5321 8 lib bdg alk paper 1 Levers Juvenile literature I Feldmann Roseann II Title 2010035551 Walker Sally M TJ147 W36 2012 621 8 dc22 Manufactured in the United States of America 1 DP 7 15 11 eISBN 978-0-7613-8007-8 2

Put Levers to the Test — page 2 — contents Chapter 1 WoRk page 4 MacHineS page 10 Chapter 2 Chapter 3 PaRtS oF a LeveR page 14 Chapter 4 cHanging tHe aMount oF FoRce page 22 Chapter 5 kinDS oF LeveRS page 30 Learn More about Simple Machines 39 Glossary 38 Index 40

Put Levers to the Test — page 3 — chapter 1 WoRk You work every day You do chores around your home At school you write It may surprise you to learn that playing and eating are work too You do work when you write What does the word work mean to a scientist 4

Put Levers to the Test — page 4 — Work using Force to Move an object When scientists use the word work they don’t mean the opposite of play Work is using force to move an object from one place to another Force is a push or a pull You use force to carry out the trash And you use force to turn the page of a book You do work when you take out the trash 5

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