•KEY CONCEPTS IN PHYSICS is a brand new series of study notes designed to meet the HKDSE Physics syllabus from year 2012 onwards. By reading this book, you will not only get a firm grasp of important physics principles, but also gain the techniques for tackling tricky phsyics questions.•In order to better help students master the crucial physics concepts, this book features: ◊simple & concise English ◊numerous "Worked Examples" to illustrate the application of principles ◊"Follow-up Questions" at the end of each section as check-points ◊challenging "Further Questions" to consolidate the concepts learnt•Whether you want to reinforce your physics concepts, or improve your question-tackling skills, KEY CONCEPTS IN PHYSICS is the book you need.