Marie Miller - Pulleys

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Table of Contents

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Pulleys

Madison Miller

SCIENCE

Simple Machine Science

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Simple Machine Science

Pulleys

By Madison Miller

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Please visit our website, www. garethstevens. com. For a free color catalog of all our high-quality books, call toll free 1-800-542-2595 or fax 1-877-542-2596.

Library of Congress Cataloging-in-Publication Data

Miller, Madison, author. Pulleys / Madison Miller. pages cm. ( Simple machine science) Includes bibliographical references and index. ISBN 978-1-4339-8142-5 ( paperback) ISBN 978-1-4339-8143-2 ( 6-pack) ISBN 978-1-4339-8141-8 ( library binding) Pulleys Juvenile literature. I. Title. TJ1103. M55 2013 dc23 2012020376

Published in 2013 by Gareth Stevens Publishing East 14th Street, Suite New York, NY 10003

Copyright 2013 Gareth Stevens Publishing

Designer: Katelyn E. Reynolds Editor: Greg Roza

Photo credits: Cover, pp. 1, iStockphoto/Thinkstock. com; pp. ( background graphics) mike. irwin/Shutterstock. com; p. Comstock/Thinkstock. com; p. iStockphoto. com/ creisinger; p. Michael Shake/Shutterstock. com; p. aragami12345s/Shutterstock. com; p. Andrew McDonough/Shutterstock. com; p. Rikard Stadler/Shutterstock. com; p. SergeyIT/Shutterstock. com; p. ppl/Shutterstock. com.

All rights reserved. No part of this book may be reproduced in any form without permission in writing from the publisher, except by a reviewer.

Printed in the United States of America

CPSIA compliance information: Batch #CW13GS: For further information contact Gareth Stevens, New York, New York at 1-800-542-2595.

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Contents

Into the Groove

Change Direction

Out to Dry

Belts and Pulleys

Heavy Lifting

Block and Tackle

Whats a Winch?

Get a Lift from Pulleys

Glossary

For More Information

Index

Boldface words appear in the glossary

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Into the Groove

A pulley is a special wheel used to do work. It has a groove around the outer edge. A rope or cable fits into the groove. The groove keeps the rope or cable from slipping off the pulley.

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Change Direction

Pulleys are used to change the direction of a pulling force. This lets us lift something up by pulling down on a rope. Flagpoles use pulleys. When you pull down on the rope, the flag goes up.

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pulley

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Out to Dry

Have you ever seen shirts hanging on a clothesline between two buildings? This type of clothesline uses two pulleys to change the direction of a pulling force. When you pull the rope toward you, the clothes go away from you.

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Belts and Pulleys

Some machines use belts and pulleys. A belt is like a rope with the ends joined together. When one pulley turns, it moves a belt. The belt then turns other pulleys. Cars use belts to turn more than one pulley.

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Heavy Lifting

We also use pulleys to lift heavy loads. Sometimes all we need is a fixed pulley. Other times, we use fixed and movable pulleys together. The more pulleys there are, the less effort is needed to lift something.

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fixed pulley

movable pulley

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Block and Tackle

A block and tackle is a special pulley system. A block is two or more pulleys on one axle. Two blocks with a rope around their pulleys are a tackle. A block and tackle uses many pulleys to make lifting a load easier.

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You may have seen block and tackles on ships. Theyre used to raise heavy sails. Big ships need big block and tackles. The more pulleys a block and tackle has, the longer the rope needs to be.

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Whats a Winch?

A winch is used to pull in and let out a rope. Some are moved by hand. Some are moved by machines. Winches and pulleys work together to lift heavy loads. Elevators use winches and pulleys. So do cranes.

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