Unit I Resolution and Composition of Forces Principle of statics, Force system, Resolution and composition of forces, Resultant of concurrent forces. Moment of a force, Varignon’s theorem, resultant of parallel force system, Couple, Equivalent force couple system, Resultant of parallel general force system. (Chapters - 1, 2) Unit II Distributed Forces and Friction Moment of area, Centroid of plane lamina and wire bends, Moment of Inertia. Friction- Laws of friction, application of friction on inclined planes Wedges and ladders friction Application to flat belt. (Chapters - 3, 4 and 5)