Introductory Physics - Building Models to Describe Our WorldThis is an open-access textbook for calculus-based introductory physics courses. The textbook is specifically intended for a flipped-classroom approach, wherein students complete readings at home and the material is then discussed in class. The textbook thus contains questions and activities to engage readers. This text also includes a curriculum in experimental physics, detailing the scientific method and process, suggesting experiments to perform at home and in the lab, and has chapters that cover: writing and reviewing proposals, writing and reviewing reports, analyzing data, as well as an introduction to python.