1　General Principles　3
Chapter Objectives　3
1.1　 Mechanics　3
1.2　 Fundamental Concepts　4
1.3　 Units of Measurement　6
1.4　 The International System of Units
1.5　 Numerical Calculations　10

2　Force Vectors　17
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　31
2.5　 Cartesian Vectors　42
2.6　 Addition and Subtraction of Cartesian Vectors　46
2.7　 Position Vectors　55
2.8　 Force Vector Directed Along a Line　58
2.9　 Dot Product　68

3　[ Equilibrium of a ParticleChapter Objectives　81
3.1　 Condition for the Equilibrium of a Particle　81
3.2　 The Free-Body Diagram　82
3.3　 Coplanar Force Systems　85
3.4　 Three-Dimensional Force Systems　98

4　Force System Resultants　113
Chapter Objectives　113
4.1　 Moment of a Force——Scalar Formulation
4.2　 Cross Product　118
4.3　 Moment of a Force——Vector Formulation　121
4.4　 Principle of Moments　126
4.5　 Moment of a Force About a Specified Axis　138
4.6　 Moment of a Couple　148
4.7　 Equivalent System　160
4.8　 Resultants of a Force and Couple System　162
4.9　 Further Reduction of a Force and Couple System　166
4.10　Reduction of a Simple Distributed Loading　180

5　Equilibrium of a Rigid Body　 193
Chapter Objectives　193
5.1　 Conditions for Rigid-Body Equilibrium　193
5.1　 Equilibrium in Two Dimensions　195
5.2　 Free-Body Diagrams　195
5.3　 Equations of Equilibrium　209
5.4　 Two- and Three-Force Members　218
5.4　 Equilibrium in Three Dimensions　231
5.5　 Free-Body Diagrams　231
5.6　 Equations of Equilibrium　237
5.7　 Constraints for a Rigid Body　238

6　Structural Analysis　257
Chapter Objectives　257
6.1　 Simple Trusses　257
6.2　 The Method of Joints　260
6.3　 Zero-Force Members　266
6.4　 The Method of Sections　272
6.5　 Space Trusses　283
6.6　 Frames and Machines　287

7　Internal Forces　325
Chapter Objectives　325
7.1　 Internal Forces Developed in Structural Members　325
7.2　 Shear and Moment Equations and Diagrams　342
7.3　 Relations Between Distributed Load，Shear， and Moment　350
7.4　 Cables　360

8　Friction　379
Chapter Objectives　379
8.1　 Characteristics of Dry Friction　379
8.2　 Problems Involving Dry Friction　383
8.3　 Wedges　404
8.4　 Frictional Forces on Screws　406
8.5　 Frictional Forces on Flat Belts　414
8.6　 Frictional Forces on Collar Bearings， Pivot Bearings， and Disks　421
8.7　 Frictional Forces on Journal Bearings　424
8.8　 Rolling Resistance　426

9　Center of Gravity and　Centroid　437
Chapter Objectives　437
9.1　 Center of Gravity and Center of Mass for a System of Particles　437
9.2　 Center of Gravity， Center of Mass and Centroid for a Body　439
9.3　 Composite Bodies　461
9.4　 Theorems of Pappus and Guldinus　475
9.5　 Resultant of a General Distributed Loading　483
9.6　 Fluid Pressure　484

10　Moments of Inertia　499
Chapter Objectives　499
10.1　 Definition of Moments of Inertia for Areas　499
10.2　 Parallel-Axis Theorem for an Area　501
10.3　 Radius of Gyration of an Area　501
10.4　 Moments of Inertia for an Area by Integration　502
10.5　 Moments of Inertia for Composite　Areas　510
10.6　Product of Inertia for an Area　518
10.7　Moments of Inertia for an Area About Inclined Axes　522
10.8　Mohrs Circle for Moments of Inertia　525
10.9　 Mass Moment of Inertia　535

11　Virtual Work 551
Chapter Objectives　551
11.1　 Definition of Work and Virtual Work　551
11.2　 Principle of Virtual Work for a Particle and a Rigid Body　554
11.3　 Principle of Virtual Work for a System　of Connected Rigid Bodies　555
11.4　Conservative Forces　568
11.5　Potential Energy　569
11.6　Potential-Energy Criterion for Equilibrium　570
11.7　Stability of Equilibrium　572
Appendices
A.　Mathematical Expressions　 584
B.　Numerical and Computer Analysis　 586
C.　Review for the Fundamentals of Engineering Examination　592
Answers to Selected Problems　 611
Index　 627