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 as: explanation of the fundamentals, concentration on core material and logical pathways through the text. The text also provides: 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.