Issuu on Google+

Physical Sciences Standards Preview Standard Set 1. Physical Sciences 1. The motion of objects can be observed and measured. As a basis for understanding this concept: 1.g. Students know sound is made by vibrating objects and can be described by its pitch and volume.

Genre

Nonfiction

Comprehension Skill

Ask and Answer Questions

by Peggy Bresnick Kendler

Text Features

• Captions • Glossary

Science Content

Sound

Scott Foresman Science 2.2

ISBN 0-328-23497-4

ì<(sk$m)=cdejhe< +^-Ä-U-Ä-U


Vocabulary pitch vibrate volume

by Peggy Bresnick Kendler

Picture Credits 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 copyright of Dorling Kindersley, a division of Pearson. Photo locators denoted as follows: Top (T), Center (C), Bottom (B), Left (L), Right (R), Background (Bkgd). Opener: Ariel Skelley/Corbis; 2 DK Images; 3 (B) ©Image Quest 3-D/NHPA Limited, (T) James H. Robinson/Photo Researchers, Inc.; 8 ©Walter Hodges/Corbis, ©George Hall/Corbis; 9 Getty Images, ©Royalty-Free/Corbis.

ISBN: 0-328-23497-4 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 permission(s), write to Permissions Department, Scott Foresman, 1900 East Lake Avenue, Glenview, Illinois 60025. 1 2 3 4 5 6 7 8 9 10 V010 13 12 11 10 09 08 07 06


What is sound? Vibrate means to move quickly back and forth. Objects vibrate and make sounds. The vibrations reach your ears. Then, you hear sounds.

This instrument makes sounds when it is hit.

2

Different Sounds People and animals make sounds. Vibrations make all sounds. Put your ďŹ ngers on the front of your throat and talk. You will feel your throat vibrate.

Living things make sounds. Parts of their bodies vibrate.

3


What is volume? Volume means how loud or soft a sound is. Your voice can be loud or soft. An airplane makes a loud sound. What else makes a loud sound? These things make loud sounds.

4

A falling leaf makes a soft sound. So does a small stream. What else makes a soft sound?

These things make soft sounds.

5


What is pitch? Pitch is how high or low a sound is. A triangle vibrates quickly. Its pitch is high. A drum vibrates slowly. Its pitch is low.

The strings on a violin vibrate quickly. They make sounds with a high pitch. The strings on a double bass vibrate slowly. They make sounds with a low pitch.

These instruments make sounds with different pitches.

The violinâ&#x20AC;&#x2122;s pitch is high. The pitch of the double bass is low.

6

7


What did you learn?

Glossary

1. How is sound made? pitch

how high or low a sound is

vibrate

move quickly back and forth

volume

how loud or soft a sound is

8

2. Which makes sound with a louder volume, a kitten or a truck? 3.

In which book would you find the definition of the word sound, a dictionary, a thesaurus, or an atlas? What information do the other books offer?

4.

Ask and Answer Questions Think about what you have just read. What is a question you might ask to learn more about pitch? Where might you find the answer to the question?


Sound