This supplemental textbook is designed to help high school students master the key concepts of physical science. The book covers topics such as motion, energy, and the properties of matter, presenting the material in a clear and engaging style. With review questions and practice problems throughout, this book is an essential tool for any high school student studying physical science. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.