Page 23 - Science and Technology Std 3

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Chapter Two
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Energy

In Chapter One, you learned about exploration of the environment.
In our environment, there are different objects which produce

energy. Energy is the ability to do work. Energy is obtained
from objects such as a whistle, a stove and a torch. Such objects

produce various forms of energy. In this chapter, you will learn
about three forms of energy. These are sound energy, heat

energy and light energy. You will also learn how these types
of energy are used in daily life.

Sound energy

Sound energy is the energy produced by vibrating sound waves.

There are two sources of sound.

1. Natural sources of sound
2. Man-made sources of sound

Natural sources of sound are animals, wind, streams and

volcanoes.

Man-made sources of sound are also called artificial sources

of sound. Artificial sources of sound are airplanes, helicopters,
trains, explosions, factories and home appliances such as
vacuum cleaners and fans.

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PROPERTY OF UNITED REPUBLIC OF TANZANIA GOVERNMENT
Ministry of Education, Science and Technology
Science and Technology 3.indd 16 03/08/2019 11:01