Designed specifically to suit the requirements of post-National Curriculum students and to fit new A-level criteria, this book maintains the features of the first edition, such explanation of the fundamentals, concentration on core material and logical pathways through the text. The text also an introduction to all topics; coverage of current A-level syllabuses, defined worked examples throughout the text to help clarify concepts and the use of formulae; a collection of questions and problems supporting the understanding of elementary ideas which have been produced in a companion volume entitled "Practice in Physics" by the same authors.