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Physical Science by Heidi Gillis Genre Nonfiction Comprehension Skill Cause and Effect Text Features · Captions · Glossary Science Content Forces and Sound Scott Foresman Science 1.9 ì<(sk$m)=bdhfhc< +^-Ä-U-Ä-U Vocabulary Movement and Sound attract force by Heidi Gillis gravity magnet pole repel speed vibrate Photographs: Every effort has been made to secure permission and provide appropriate credit for photographic material. The publisher deeply regrets any omission and pledges to correct errors called to its attention in subsequent editions. Unless otherwise acknowledged, all photographs are the property of Scott Foresman, a division of Pearson Education. Photo locators denoted as follows: Top (T), Center (C), Bottom (B), Left (L), Right (R) Background (Bkgd) Opener: ©Photographer’s Choice/Getty Images; 2 ©Photodisc Green/Getty Images; 3 ©Frank Siteman/PhotoEdit; 4 Getty Images; 8 ©DK Images; 9 ©DK Images; 12 ©DK Images; 13 (TL) Getty Images, (BL) ©DK Images; 14 ©Alan Schein Photography/Corbis; 15 ©George F. Mobley/NGS Image Collection ISBN: 0-328-13757-X Copyright © Pearson Education, Inc. All Rights Reserved. Printed in the United States of America. This publication is protected by Copyright and permission should be obtained from the publisher prior to any prohibited reproduction, storage in a retrieval system, or transmission in any form by any means, electronic, mechanical, photocopying, recording, or likewise. For information regarding permissions, write to: Permissions Department, Scott Foresman, 1900 East Lake Avenue, Glenview, Illinois 60025. 3 4 5 6 7 8 9 10 V010 13 12 11 10 09 08 07 06 05 What makes things move? Gravity is a force. Force is a push or pull. Force may make something move. Gravity pulls things down. The sled goes down the hill. Push the sled up a hill. The girl uses force to move the snow. 2 3 What is speed? Push the car again. Push the car. Push it with a lot of force. It goes fast. Use less force. Now the speed of the car is slow. Force changes how things move. Speed is how fast or slow things move. 4 5 How do things move? Different Places Things can move up and down. Things can move left and right. They can go straight or curve. How else can things move? 6 Look at the blocks. Which one is on top? Which one is on the bottom? Which one is next to the tower? 7 ... - tailieumienphi.vn