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Method, of joints, 88 Screw, friction in, 78
of sections, 91 Sections, method of, 91
Moment, of a couple, 46 Speed, 105
of a force, 35 Static friction, 68
arm, 35 Statics, 7
Motion, impending, 68, 73, 78 Statical determinacy, 61
of particle, 103, 130 System, force–couple, 50
of relative, 130, 137 of forces, concurrent, 16, 27
of rigid bodies, 120, 137 coplanar, 16, 32, 54
parallel, 16, 55, 94
Osculating plane, 114 of interconnected bodies, 65
Parallel forces, 16, 55, 94 Tension in truss members, 87
Parallelogram law, 26 Theorem of Varignon, 43
Particle, 8 Three-force member, 27
equilibrium of, 31 Time, 8
kinematics of, 103, 130 Transmissibility, principle of,
Plane motion, general, 123, 137 25, 39
Polygon, of forces, 28, 31, 45 Triangle law, 26
Position vector, 104, 121 Trusses, 85
Principle, of moments, 43 Two-force members, 24, 66, 88
of transmissibility, 25, 39
Unit vectors, 11, 109, 114, 133
Reactive forces, 17, 19, 21, 68
Reference frame, 107, 109, 113, Varignon’s theorem, 43
114, 121, 131 Vectors, addition of, 9, 28
Relative acceleration, 135, 146 components of, 10, 29
Relative motion, 130, 137 cross or vector product of,
Relative velocity, 133, 139 38, 128, 136
Resultant, of concurrent forces, Velocity, absolute, 132, 134
27, 53 angular, 111, 125
of coplanar forces, 32, 54 average, 104
couple, 49 instantaneous, 105
of general force system, 45 instantaneous axis or center
of parallel forces, 55, 94 of, 142
Right-hand rule, 36, 48, 125, rectangular components of,
137 107
Rigid body, 9, 120
Rotating axes, 132 Wedges, friction in, 76
Rotation, finite, 149 Weight, 93
instantaneous axis, 136, 151 Wrench, reduction, 55
a rigid body, 125, 137, 149
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