Scott Foresman Science 2.2

Genre Comprehension Skill Text Features Science Content

Nonfi ction Ask and Answer Questions

Captions

Glossary

Sound

StandardsPreview

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.

ISBN 0-328-23497-4

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ISBN: 0-328-23497-4

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Vocabulary

pitchvibratevolume

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by Peggy Bresnick Kendler

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2What 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.

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3

Different Sounds

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

Living things make sounds. Parts of their bodies vibrate.

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4What 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.

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5

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

These things make soft sounds.

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6What 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.

These instruments make sounds with different pitches.

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7

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.

The violins pitch is high.The pitch of the double bass is low.

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8pitch how high or low a sound is

vibrate move quickly back and forth

volume how loud or soft a sound is

Glossary

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What did you learn?1. How is sound made?

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

3. In which book would

you fi nd the defi nition 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 fi nd the answer to the question?

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