This edition is in full colour and in line with the requirements of the National Curriculum and the revised GSCE Physics syllabuses. It is designed for students studying for GCSE, IGCSE, UCLES Cambridge and London overseas O level Physics and equivalent examinations. Since publication "GCSE Physics" has been adopted and it is now established as one of the leading courses for students preparing for GCSE or equivalent examinations, throughout the world. It has been updated for the third edition to keep in line with the revised National Curriculum and the new GCSE Physics syllabuses. New features include: redesigned layout, with colour used to highlight features such as extension work and checklists; artwork and photographs updated and full colour used throughout; chapters on energy and energy sources expanded and updated; a new section, "Physics Investigations", including 21 suggestions for activities; and questions revised to include ones from recent past papers.