Engineering Mechanics-Statics Principles

by Bedford, Anthony; Fowler, Wallace T.

• ISBN13: 9780130082077
• ISBN10: 0130082074
• Edition: 3rd
• Format: Paperback
• Copyright: 2003-01-01
• Publisher: Prentice Hall

Summary

For second-year Introductory courses taught in departments of Mechanical, Civil, Aerospace, General, and Engineering Mechanics.More than just a book, this text is part of a system to teach engineering mechanics, a system comprised of three components: 1) this core principles book, 2) algorithmic problem material available online, and 3) a course management system to track and monitor student progress. By using this system, instructors and their students benefit from increased flexibility in the ability to assign and grade problems, and the ability to make sure each student works a "unique" version of a problem, all coming at a lower price and in a smaller package.

Table of Contents

1. Introduction.

Engineering and Mechanics. Learning Mechanics. Fundamental Concepts. Units.

2. Vectors.

Vector Operations and Definitions. Scalars and Vectors. Rules for Manipulating Vectors. Cartesian Components. Components in Two Dimensions. Components in Three Dimensions. Products of Vectors. Dot Products. Cross Products. Mixed Triple Products.

3. Forces.

Types of Forces. Equilibrium and Free-Body Diagrams. Two-Dimensional Force Systems. Three-Dimensional Force Systems.

4. Systems of Forces and Moments.

Two-Dimensional Description of the Moment. The Moment Vector. Moment of a Force about a Line. Couples. Equivalent Systems. Representing Systems by Equivalent Systems.

5. Objects in Equilibrium.

The Equilibrium Equations. Two-Dimensional Applications. Statically Indeterminate Objects. Three-Dimensional Applications. Two-Force and Three-Force Members.

6. Structures In Equilibrium.

Trusses. The Method of Joints. The Method of Sections. Space Trusses. Frames and Machines.

7. Centroids and Centers of Mass.

Centroids. Centroids of Areas. Centroids of Composite Areas. Distributed Loads. Centroids of Volumes and Lines. The Pappus-Guldinus Theorems. Centers of Mass. Definition of the Center of Mass. Centers of Mass of Composite Objects.

8. Moments of Inertia.

Areas. Definitions. Parallel-Axis Theorems. Rotated and Principal Axes. Masses. Simple Objects. Parallel-Axis Theorem.

9. Friction.

Theory of Dry Friction. Applications.

10. Internal Forces and Moments.

Beams. Axial Force, Shear Force, and Bending Moment. Shear Force and Bending Moment Diagrams. Relations between Distributed Load, Shear Force, and Bending Moment. Cables. Loads Distributed Uniformly Along Straight Lines. Loads Distributed Uniformly Along Cables. Discrete Loads. Liquids and Gases. Pressure and the Center of Pressure. Pressure in a Stationary Liquid.

11. Virtual Work and Potential Energy.

Virtual Work. Potential Energy.

Excerpts

Our original objective in writing this book was to present the foundations and applications of statics as we do in the classroom. We used many sequences of figures, emulating the gradual development of a figure by a teacher explaining a concept. We stressed the importance of visual analysis in gaining understanding, especially through the use of free-body diagrams. Because inspiration is so conducive to learning, we based many of our examples and problems on a variety of modern engineering applications. With encouragement and help from many students and fellow teachers who have used the book, we continue and expand upon these themes in this edition. Examples that Teach The Strategy/Solution/Discussion framework employed in most of our examples is designed to emphasize the critical importance of good problem-solving skills. Our objective is to teach students how to approach problems and critically judge the results. Engineering Design We include simple design considerations in many examples and problems without compromising emphasis on fundamental mechanics. Design problems are marked with aDicon, Optional examples titled "Application to Engineering" provide more detailed discussions of the uses of dynamics in engineering design. Computational Mechanics Some instructors prefer to teach statics without requiring the use of a computer. Others use statics as an opportunity to introduce students to the use of computers in engineering, having them either write their own programs in a lower level language or use higher level problem-solving software. Our book is suitable for each of these approaches. We provide optional, self-contained "Computational Mechanics" sections with examples and problems designed for solution by a programmable calculator or computer. In addition, tutorials on using Mathcad and MATLAB in engineering mechanics are available from our text's website. See Supplements (page xxi) for a further description. Consistent Use of Color To help students recognize and interpret elements of figures, we use consistent identifying colors for: Unit vectors Forces Positions Couples New to the Third Edition Positive responses from users and reviewers have led us to retain the basic organization, and features of the first edition. During our preparation of this edition, we examined how we presented each concept, example, figure, summary statement, and problem. Where necessary, we made changes, additions, or deletions to simplify and clarify the presentation. In response to requests, we made the following notable changes: We have added new examples where users indicated more were needed. Many of the new examples continue our emphasis on realistic and motivational applications and engineering design. New sets ofStudy Questionsappear after most sections to help students check their retention of key concepts. Each example is clearly labeled for its teaching purpose. We have redesigned the text and also added photographs throughout to help students connect the text to real world applications and situations. An extensive new supplement program includes web-based assessment software, visualization software, and much more. See the Supplements description for complete information. Commitment to Students and Instructors In revising the textbook and solutions manual, we have taken precautions to ensure accuracy to the best of our ability. We have each solved the new problems in an effort to be sure that their answers are correct and that they are of an appropriate level of difficulty. Karim Nohra of the University of South Florida also checked the text, examples, problems and solutions manual. Any errors that remain are the responsibility of the authors. We welcome communication from students and instructors concerni