Engineering Mechanics Statics & Dynamics

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R.C. Hibbeler graduated from the University of Illinois at Urbana with a BS in Civil Engineering (majoring in Structures) and an MS in Nuclear Engineering. He obtained his PhD in Theoretical and Applied Mechanics from Northwestern University. Professor Hibbeler’s professional experience includes postdoctoral work in reactor safety and analysis at Argonne National Laboratory, and structural and stress analysis work at Chicago Bridge and Iron, as well as at Sargent and Lundy in Chicago. He has practiced engineering in Ohio, New York, and Louisiana.

Professor Hibbeler currently teaches both civil and mechanical engineering courses at the University of Louisiana– Lafayette. In the past, he has taught at the University of Illinois at Urbana, Youngstown State University, Illinois Institute of Technology, and Union College.

Chapter Objectives 3

1.1 Mechanics 3

1.2 Fundamental Concepts 4

1.3 Units of Measurement 7

1.4 T he International System of Units 9

1.5 Numerical Calculations 10

1.6 General Procedure for Analysis 12

Chapter Objectives 17

2.1 Scalars and Vectors 17

2.2 Vector Operations 18

2.3 Vector Addition of Forces 20

2.4 Addition of a System of Coplanar Forces 32

2.5 C artesian Vectors 43

2.6 Addition of Cartesian Vectors 46

2.7 Position Vectors 56

2.8 Force Vector Directed Along a Line 59

2.9 Dot Product 69

Chapter Objectives 85

3.1 Condition for the Equilibrium of a Particle 85

3.2 The Free-Body Diagram 86

3.3 Coplanar Force Systems 89

3.4 Three-Dimensional Force Systems 103

Chapter Objectives 117

4.1 Moment of a Force–Scalar Formulation 117

4.2 Cross Product 121

4.3 Moment of a Force–Vector Formulation 124

4.4 Principle of Moments 128

4.5 Moment of a Force about a Specified Axis 139

4.6 Moment of a Couple 148

4.7 Simplification of a Force and Couple System 160

4.8 Further Simplification of a Force and Couple System 170

4.9 Reduction of a Simple Distributed Loading 183

Chapter Objectives 199

5.1 Conditions for Rigid-Body Equilibrium 199

5.2 Free-Body Diagrams 201

5.3 Equations of Equilibrium 214

5.4 Two- and Three-Force Members 224

5.5 Free-Body Diagrams 237

5.6 Equations of Equilibrium 242

5.7 Constraints and Statical Determinacy 243

Chapter Objectives 263

6.1 Simple Trusses 263

6.2 The Method of Joints 266

6.3 Zero-Force Members 272

6.4 The Method of Sections 280

6.5 Space Trusses 290

6.6 Frames and Machines 294

Chapter Objectives 331

7.1 Internal Loadings Developed in Structural Members 331

7.2 Shear and Moment Equations and Diagrams 347

7.3 Relations between Distributed Load, Shear, and Moment 356

7.4 Cables 367

Chapter Objectives 389

8.1 Characteristics of Dry Friction 389

8.2 Problems Involving Dry Friction 394

8.3 Wedges 416

8.4 Frictional Forces on Screws 418

8.5 Frictional Forces on Flat Belts 425

8.6 Frictional Forces on Collar Bearings, Pivot Bearings, and Disks 433

8.7 Frictional Forces on Journal Bearings 436

8.8 Rolling Resistance 438

Chapter Objectives 451

9.1 Center of Gravity, Center of Mass, and the Centroid of a Body 451

9.2 Composite Bodies 474

9.3 Theorems of Pappus and Guldinus 488

9.4 Resultant of a General Distributed Loading 497

9.5 Fluid Pressure 498

Chapter Objectives 515

10.1 Definition of Moments of Inertia for Areas 515

10.2 Parallel-Axis Theorem for an Area 516

10.3 Radius of Gyration of an Area 517

10.4 Moments of Inertia for Composite Areas 526

10.5 Product of Inertia for an Area 534

10.6 Moments of Inertia for an Area about Inclined Axes 538

10.7 Mohr’s Circle for Moments of Inertia 541

10.8 Mass Moment of Inertia 549

Chapter Objectives 567

11.1 Definition of Work 567

11.2 Principle of Virtual Work 569

11.3 Principle of Virtual Work for a System of Connected Rigid Bodies 571

11.4 Conservative Forces 583

11.5 Potential Energy 584

11.6 Potential-Energy Criterion for Equilibrium 586

11.7 Stability of Equilibrium Configuration 587 Appendix

Contents

12.1 Introduction

12.2 Rectilinear Kinematics: Continuous Motion

12.3 Rectilinear Kinematics: Erratic Motion

12.4 General Curvilinear Motion

12.5 Curvilinear Motion: Rectangular Components

12.6 Motion of a Projectile

12.7 Curvilinear Motion: Normal and Tangential Components

12.8 Curvilinear Motion: Cylindrical Components

12.9 Absolute Dependent Motion Analysis of Two Particles

12.10 Relative-Motion of Two Particles Using Translating Axes

13.1 Newton’s Second Law of Motion

13.2 The Equation of Motion

13.3 Equation of Motion for a System

of Particles

13.4 Equations of Motion: Rectangular Coordinates

13.5 Equations of Motion: Normal

and Tangential Coordinates

13.6 Equations of Motion: Cylindrical Coordinates

*13.7 Central-Force Motion and Space Mechanics

14.1 The Work of a Force

14.2 Principle of Work and Energy

14.3 Principle of Work and Energy for a System of Particles

14.4 Power and Efficiency

14.5 Conservative Forces and Potential Energy

14.6 Conservation of Energy

15.1 Principle of Linear Impulse and Momentum

15.2 Principle of Linear Impulse and Momentum for a System of Particles

15.3 Conservation of Linear Momentum for a System of Particles

15.4 Impact

15.5 Angular Momentum

15.6 Relation Between Moment of a Force and Angular Momentum

15.7 Principle of Angular Impulse and Momentum

15.8 Steady Flow of a Fluid Stream

*15.9 Propulsion with Variable Mass

16.1 Planar Rigid-Body Motion

16.2 Translation

16.3 Rotation about a Fixed Axis

16.4 Absolute Motion Analysis

16.5 Relative-Motion Analysis: Velocity

16.6 Instantaneous Center of Zero Velocity

16.7 Relative-Motion Analysis: Acceleration

16.8 Relative-Motion Analysis using Rotating Axes

17.1 Mass Moment of Inertia

17.2 Planar Kinetic Equations of Motion

17.3 Equations of Motion: Translation

17.4 Equations of Motion: Rotation about a Fixed Axis

17.5 Equations of Motion: General Plane Motion

18.1 Kinetic Energy

18.2 The Work of a Force

18.3 The Work of a Couple Moment

18.4 Principle of Work and Energy

18.5 Conservation of Energy

19.1 Linear and Angular Momentum

19.2 Principle of Impulse and Momentum

19.3 Conservation of Momentum

*19.4 Eccentric Impact

20.1 Rotation About a Fixed Point

*20.2 The Time Derivative of a Vector Measured from Either a Fixed

or Translating-Rotating System

20.3 General Motion

*20.4 Relative-Motion Analysis Using Translating and Rotating Axes

*21.1 Moments and Products of Inertia

21.2 Angular Momentum

21.3 Kinetic Energy

*21.4 Equations of Motion

*21.5 Gyroscopic Motion

21.6 Torque-Free Motion

*22.1 Undamped Free Vibration

*22.2 Energy Methods

*22.3 Undamped Forced Vibration

*22.4 Viscous Damped Free Vibration

*22.5 Viscous Damped Forced Vibration

*22.6 Electrical Circuit Analogs

A Mathematical Expressions

B Vector Analysis

C The Chain Rule

Fundamental Problems Partial

Solutions and Answers

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