CHAPTER 1 Engines 4 CHAPTER 2 Wings 12 CHAPTER 3 Controls 16 ACTIVITIES TOOLS Try This 22 Glossary 23 Index 24 To Learn More 24 ENGINES What happens when you jump into the air You land Why Gravity pulls you back down Gravity is a law of science But an airplane can fly high in the sky for hours How do airplanes work Let’s find out 
