Energy is a fundamental concept in physics, playing an important role in every aspect of the world around us. The conversion of energy among its many forms has enabled both the sustenance of living organisms on Earth and our development of a society based on the manufacture of products for our own convenience. All of these aspects of energy are treated in this AAPT/PTRA resource book written by John Roeder, beginning with the relationship between the force and distance required to pull a roller coaster to the top of its first hill along inclines of different slope, and ending with energy choices we will need to make for our future. Included are activities, energy games, and teacher's notes.