The main objective of a first course in mechanics should be to develop in the engineering student the ability to analyze any problem in a simple and logical manner and to apply to its solution a few, well- understood, basic principles. This text is designed for the first courses in statics and dynamics offered in the sophomore or junior year, and it is hoped that it will help the instructor achieve this goal.
Vector analysis is introduced early in the text and is used throughout the presentation of statics and dynamics. This approach leads to more concise derivations of the fundamental principles of mechanics. It also results in simpler solutions of three-dimensional problems in statics and makes it possible to analyze many advanced problems in kinematics and kinetics, which could not be solved by scalar methods. The emphasis in this text, however, remains on the correct understanding of the principles of mechanics and on their application to the solution of engineering problems, and vector analysis is presented chiefly as a convenient tool.
Practical Applications Are Introduced Early. One of the characteristics of the approach used in this book is that mechanics of particles is clearly separated from the mechanics of rigid bodies. This approach makes it possible to consider simple practical applications at an early stage and to postpone the introduction of the more difficult concepts. For example:
- In Statics, the statics of particles is treated first (Chap. 2); after the rules of addition and subtraction of vectors are introduced, the principle of equilibrium of a particle is immediately applied to practical situations involving only concurrent forces. The statics of rigid bodies is considered in Chaps. 3 and 4. In Chap. 3, the vector and scalar products of two vectors are introduced and used to define the moment of a force about a point and about an axis. The presentation of these new concepts is followed by a thorough and rigorous discussion of equivalent systems of forces leading, in Chap. 4, to many practical applications involving the equilibrium of rigid bodies under general force systems.
- In Dynamics, the same division is observed. The basic concepts of force, mass, and acceleration, of work and energy, and of impulse and momentum are introduced and first applied to problems involving only particles. Thus, students can familiarize themselves with the three basic methods used in dynamics and learn their respective advantages before facing the difficulties associated with the motion of rigid bodies.
List of Symbols
2. Statics of Particles
3. Rigid Bodies: Equivalent Systems of Forces
4. Equilibrium of Rigid Bodies
5. Distributed Forces: Centroids and Centers of Gravity
6. Analysis of Structures
7. Forces in Beams and Cables
9. Distributed Forces: Moments of Inertia
10. Method of Virtual Work
11. Kinematics of Particles
12. Kinetics of Particles: Newton’s Second Law
13. Kinetics of Particles: Energy and Momentum Methods
14. Systems of Particles
15. Kinematics of Rigid Bodies
16. Plane Motion of Rigid Bodies: Forces and Accelerations
17. Plane Motion of Rigid Bodies: Energy and Momentum Methods
18. Kinetics of Rigid Bodies in Three Dimensions
19. Mechanical Vibrations
Appendix Fundamentals of Engineering Examination
Answers to Problems
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