The pervasive applications of mechanical and electromechanical systems have been significantly increasing with the growing needs of managing power for accomplishment of complex tasks involving movement and forces. In the recent decades the systems have become even more complex from engineering perspectives. The role of understanding dynamics in a systematic manner has thus become much more persuasive in mechanical engineering. This edition of the book not only covers the classical concepts of dynamics of mechanical and electromechanical systems but also details the modern day applications of the explained theories and concepts. The text has been designed to fit the present day needs of readers in understanding the fundamental principles of dynamics and exploring its applications in sophisticated systems of engineering interest that may also be experienced in variety of aspects in daily life. The book commences into the domain of dynamics systems with introduction of Hamilton s principle in first chapter which is further extensively utilized in rest of the content to serve the purpose of improving unified approach of understanding of both mechanical and electrical systems. The book maintains the steady use of variational methods as alternative technique for solving dynamic problems to help student in comprehending fundamental principles in better manner. The examination of dynamics of rigid bodies has been done in the third chapter along with detailing the analysis of various rigid body systems of modern day engineering interests. The content of this edition also inherits the philosophy of holding up the learning of dynamics through in-depth insight into applications of theories applied in actual engineering problems and applications. The book stresses on giving its readers experience of applying the fundamental principles in widespread applications which are vigilantly selected based on their importance in engineering. The purpose of these carefully picked problems and examples is to develop a thorough learning experience with complete understanding of principles read initially. We are of a firm conviction that the book will certainly help students in building a strong foundation in dynamics of mechanical and electromechanical systems.