This series of textbooks for the middle-school level follows the syllabus prescribed by the Council for the Indian School Certificate Examinations. It aims to create an interest in the subject by explaining the laws of physics in a simple manner and by drawing upon everyday examples of the application of these laws. It also encourages the students to take an active part in the learning process by experimenting on their own. Some features of this series are: Simple activities that the students can do on their own, using materials that are easily available An emphasis on making observations and drawing conclusions Illustrative diagrams and photographs to aid the comprehension of the text Examples from everyday life to help the students relate to the text Solved examples to facilitate the comprehension of the quantitative aspects of the subject Highlighted definitions, laws and terms for easy identification A summary of the important points in each chapter to aid recall and retention An effort to dispel common misconceptions A section called Postscript at the end of some chapters to encourage students to explore further Exercises designed to test the comprehension of the concepts learnt in each chapter