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Chapter 5: Energy

Difficulty Level: At Grade Created by: CK-12


The surfer in this photo is dwarfed by the immense wave he’s riding, yet he’s managing to use the incredible energy of the wave for a thrilling ride. Ocean waves like this one carry a huge amount of energy. Do you know what energy is? Can you identify other forms of energy besides ocean waves? In this unit, you’ll learn a lot about energy, including how it makes modern life possible—even if you never ride a surfboard!

Chapter Outline

Chapter Summary


This unit introduces energy and energy resources. Different forms of energy—including thermal and sound energy—are described. The unit also explains how energy travels in waves, how light energy behaves, and how we use light to see. Electricity and magnetism, and the relationship between them, are explored as well.

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Difficulty Level:

At Grade



7 , 8

Date Created:

Dec 22, 2014

Last Modified:

Feb 23, 2015
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