The Physics Companion, Volume II: Beyond the Newtonian Perspective is a companion to fields, waves, and modern physics for high school students and anyone interested in self-study. Volume II builds on the Newtonian foundation to explore the rest of the physical universe. Across twelve units it covers gravitation and the fields that act at a distance, electricity, circuits, and magnetism, oscillations, sound, and light, the quantum world, nuclear and particle physics, special relativity, and cosmology. Every topic pairs clear explanations with worked examples, labeled diagrams, guiding questions, and practice problems with full step-by-step solutions. Key equations, a complete glossary, and a detailed index are built in, so students can review efficiently.