Engineering Mechanics (BPUT Orissa) By Dr. I.S. Gujrat

Engineering Mechanics (BPUT Orissa) By Dr. I.S. Gujrat
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Engineering Mechanics (BPUT Orissa) By Dr. I.S. Gujrat

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Publisher: Laxmi Publications
ISBN: 9789381159132
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Preface The subject ENGINEERING MECHANICS is taught in the very first year of the undergraduate Engineering curriculum in almost all universities of the world. An engineering student starts learning to develop his capability to model an actual problem into an engineering problem and obtains its solution by using the fundamental principles and concepts of Engineering Mechanics Engineering problems, to a great extent, require the drawing of the free-body diagrams of the entire body and also of a small portion cut from it. Students are, therefore, advised to learn drawing of the free-body diagrams. The entire book is divided into two portions-Statics and Dynamics. In the book SI system of units have been used. Analytical methods are emphasized throughout this book but the graphical and also the semi-graphical methods have not been neglected. Most of the fundamentals needed to learn the basics of Engineering Mechanics have been discussed in the First Chapter. Chapter on Trusses has been discussed at length. Here, certain so called checks are presented which a student is advised to use to ascertain the correctness of his solution. If the check fails, the student should hurriedly go through his solution to correct the mistake. A very large number of solved examples and the unsolved problems have been given for practice. The method of sections has also been discussed at length. Separate chapters on Coplanar Parallel Force Systems Friction Centre of Gravity Moments of inertia of Plane Areas have been included. Standard cases of areas dealing with centroids and moment of inertia have been given in tabular forms for ready reference. A separate chapter on Virtual Work has been given. The concept of virtual work has been presented in a very simple fashion. Chapters on Dynamics include Kinematics of Rectilinear Motion Dynamics of Rectilinear Motion Dynamics of Particle-Curvilinear Motion Center of Gravity and Mass Moment of Inertia Curvilinear Motion and Motion of Rotation of Rigid Bodies and Impact or Collision of Elastic bodies. This book has been written to help the students in understanding the fundamentals of the subject and to develop their ability to deal any situation. Although this book has been written for students of Odisha Technical University but it is hoped that the material presented in this book will be of value to the students and teachers of all Indian universities as well. It will help students in preparing for competitive examinations such as GATE, GRE, IES, IAS, PSC AMIE and other public sector examinations. Many standard books on the subject have been used in preparation of this book and the author thankfully acknowledges the same. The valuable suggestions from learned teachers of the subject would help the author in improving the quality of this book. I also acknowledge the moral support from my wife Smt. Kuldip Kaur and my all children for bearing with me during the long period of writing of this book. Author
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1 System of Forces PART A FUNDAMENTAL PRINCIPLES AND RELATIONS 1.1. INTRODUCTION Mechanics is that branch of science which deals with the state of rest or motion of bodies under the action of forces. No one subject plays a greater role in the engineering analysis and application than mechanics. Modern research and advancements in the fields of stability, strength and design of structures and machines, vibration, robotics, rockets, missiles, aeroplane and spacecraft design, automobiles, automatic control, fluid flow, engine performance, electrical machines and apparatus, transmission towers, superstructures, heavy earth moving machines, locomotives, metro railways, super sonic aircrafts molecular, atomic and subatomic behaviour, etc., are highly dependent on the basic principles of mechanics. A thorough and clear understanding of this subject is an essential requirement for work in these and