This book presents the central ideas of physics, classical and modern, without using any mathematics more advanced than simple algebra. There is no trigonometry and vectors are treated graphically. It is especially designed for the one-semester or one-quarter course usually offered to non-science majors. The topics covered and their organizational, for the most part, traditional. The introductory chapter discusses the nature of physics, the scientific method, and previews the forms taken by the laws of physics. This followed by three chapters on mechanics, three on thermodynamics, four on electrodynamics and waves and three on modern physics. An appendix briefly summarizes some elementary mathematics.