Physics is the study of matter and energy. Interactions of matter and energy create everything, from the thunderous roar of a waterfall to the crackling sizzle of an egg frying in a pan. Physicists understand those complex events by studying simpler ones. Supporting the Next Generation Science Standards, this book, which features lively text enhanced by full-color images and straightforward activities, illustrates how the study of simple events can improve comprehension of the complex physical world. Readers will hone their observational skills and begin to understand the common threads that link distinct observations.