Elementary Dynamics

Preface

The present book is the second of my two books on statistics and Dynamics. The first book on statistics was already published by NCERT in 1986. This book like the previous one is mainly intended for the students of senior secondary classes for those States where it is included in the plus two syllabi of Mathematics. Students can also use this book for the preparation of various all-India Competitive Examinations where questions are asked in Mechanics. The need to study Mechanics consisting of Statics and Dynamics in schools has been discussed in the “Preface” of the earlier book.

The topics chosen for this book are based on those which are followed by various States and various competitive examinations. Emphasis has been given on the basic theory as well as various types of challenging problems like that given in my previous book on statistics. Knowledge of mathematics beyond the plus two stage has not been assumed anywhere in this book. A large number of problems, simple and difficult, have been worked out and given in the exercises so as to enable all students, gifted or average, to use the book without much difficulty. The S.I. System of all physical quantities has been used throughout this book. Some well known problems which were asked in various examinations have been included in this book with slight modifications by changing the system of units and removing the vagueness in the traditional language. A number of multiple-choice objective-type questions from each topic have been given in the appendix to facilitate students appearing at various all-India competitive examinations where these types of questions are generally asked. It is hoped that such students as well as students of physics may be benefited from this book.

The manuscripts, prepared by me, have been reviewed thoroughly by teachers of Schools, Colleges and Universities, who are specialised in the subject. They are Dr. A. Satyanarayan Rao, Andhra University, Prof. S. Basuli, Visva-Bharati, Shantiniketan, West Bengal, Dr. H.B.P. Sinha, Science College, Patna, Dr. M.K. Sen, North Bengal University. West Bengal, Prof. N.R. Chakraborty, A.C. College, Jalpaiguri, West Bengal, Dr P.K. Mukherjee, Deshbandhu College, New Delhi, Dr. P. Biswas, P.D. Women’s College, Jalpaiguri, Dr. P. Goswami, Deshbandhu College, New Delhi, Shri S. Shome, Fanindra Dev Institution, Jalpaiguri, West Bengal, Shri N. Lahiri, B.K.C. College, Calcutta, Shri S.S. Vashist, Naval Public School, New Delhi, Shri A. Mitra, Sonaullah H.S. School, Jalpaiguri, Mrs K. Sengupta, Govt. Girls’ School, Jalpaiguri, Shri M.