Students know sound is made by vibrating objects and can be described by its pitch and volume... How Sounds Are Made Things that vibrate make a sound.. Volume means how loud or soft a
Trang 1Genre Comprehension Skill Text Features Science Content
Nonfi ction Ask and Answer
Questions
• Captions
• Glossary
Sound
Scott Foresman Science 2.2
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.
ISBN 0-328-23498-2
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Physical Sciences
Trang 2Picture Credits
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Unless otherwise acknowledged, all photographs are the copyright © of Dorling Kindersley, a division of Pearson.
ISBN: 0-328-23498-2
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Vocabulary
pitch
vibrate
volume
Trang 3How Sounds
Are Made
Things that vibrate make a sound Vibrate
means to move back and forth quickly
When the boy plays the cymbals, you can
see them vibrate The cymbals make the air
around them vibrate too You hear sound when
the vibrations get to your ear
Musical instruments
each have their
own sound.
3
Parts of you vibrate when you make sound
Put your fi ngers to your throat as you talk You will feel vibrations on them
Many other living things make sounds A lion makes a roaring sound with its throat
The lion’s throat vibrates
as he roars.
The girl’s throat vibrates
as she sings.
Trang 4Loud or Soft?
Volume means how loud or soft a sound is
Some sounds are loud A large truck driving by
makes a loud sound Other sounds are soft A
bicycle riding by makes a soft sound
The sounds made by
trucks and bicycles
have different volumes.
5
Look at the pictures of things that make loud and soft sounds Can you think of something else that makes a loud sound? Can you think of something else that makes a soft sound?
Birds make soft sounds Gongs make louder sounds Elephants make the loudest sounds of all!
Trang 5High or Low?
Some things make a high sound Other things
make a low sound Pitch means how high or
low a sound is Things with a high pitch vibrate
quickly Things with a low pitch vibrate slowly
The girl on the right is
playing the triangle
Triangles make sounds
with a high pitch.
7
The recorder has a high pitch The double
bass has a low pitch
Can you think of another musical instrument that has a high pitch? How about one with a low pitch?
The girl’s recorder has a high pitch
The man’s double bass has a low pitch.
Trang 6pitch how high or low a sound is
vibrate move quickly back and forth
volume how loud or soft a sound is
1 What happens when an object vibrates?
2 What kinds of sounds have a high pitch?
look up the defi nitions of two musical instruments Write a sentence that tells if each instrument has a high pitch or a low pitch
partner, take turns asking and answering these questions: What objects can you think
of that make loud sounds? What objects can you think of that make soft sounds?