This fourth edition of Physics for the IB Diploma has been written for the IB student. It covers the entire new IB syllabus including all options at both Standard and Higher levels. It includes a chapter on the role of physics in the Theory of Knowledge along with many discussion questions for TOK with answers. There are a range of questions at the end of each chapter with answers at the back of the book. The book also includes worked examples and answers throughout, and highlights important results,laws, definitions and formulae. Part I of the book covers the core material and the additional higher level material (AHL). Part II covers the optional subjects.