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Components of a force, 9, 12, coplanar, 16, 32, 54
29 parallel, 16, 55, 94
Composite bodies, center of Frame of reference, 107, 109,
mass of, 102 113, 114, 121, 131
Compression in truss members, Free-body diagram, 16, 26, 66
86 Friction, angle of, 69
Concentrated forces, 13 belt, 80
Concurrent forces, 29, 31 coefficients of, 69
Coplanar forces, 9, 16, 29, 59 dry, 67
Coriolis acceleration, 135 rolling, 83
Couple, 46 screw thread, 78
Cross or vector product, 38, wedge, 76
128, 136
Curvature, center of, 114, 115 Gravity, center of, 93, 101
radius of, 113, 115 General plane motion, 123, 137
Diagram, free-body, 16, 26, 66 Hodograph, 105
Direction cosines, 12, 46, 108
Displacement, 104,125, 138 Impending motion, 68, 73, 78
Displacement, angular, 120 Inertial system, 131
Distributed forces, 13 Instantaneous axis of rotation,
Distributive law, 43 136, 151
Instantaneous center of zero
Equilibrium, alternative velocity, 142
equations of, 60 Interconnected bodies, 65
of concurrent forces, 31
condition of, 56 Joints, method of, 88
equations of, 58
External effects of force, 25, 51 Kinematics, 103
of particle, 103, 130
Force, action of, 9 of relative motion, 130, 137
components of, 10 of rigid bodies, 120, 137
concentrated, 13
distributed, 13 Law, of cosines, 26
friction, 66 distributive, 43
moment of, 35 parallelogram, 26
polygon, 28, 31, 45 triangle, 26
reactive, 17, 19, 21, 68 Length, 8
resultant, 27, 45 Line of action, 9
Force–couple system, 50
Force system, arbitrary, 16, 45 Mass, 8
concurrent, 16, 27, 53 Mechanics, 6, 7
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