CHAPTER 1 What Is Energy 5 CHAPTER 2 What Forms Can Energy Take 11 CHAPTER 3 How Do People Use Energy 21 SCIENCE IN ACTION Making Electricity 26 Focus on Energy 28 Glossary 30 To Learn More 31 Index 32 TABLE OF CONTENTS
CHAPTER 1 WHAT IS ENERGY A farmer wants to plant seeds But first she needs to make the ground ready So she turns the key on her tractor The engine roars to a start The farmer drives the tractor to prepare the ground Vehicles such as tractors need energy to move 5
