A brief introduction to the study of physics, with a focus on matter, energy, and their interactions for students in high school physics courses including IB, AP-1 Physics, AP-2 Physics, and others. For more information, check out aplusphysics.com, and for the ultimate Regents Physics test prep guide, pick up a copy of APlusPhysics: Your Guide to Regents Physics Essentials (aplusphysics.com/regents)