Basic notation, Newton Laws of motion, system of two forces, parallelogram law of forces, resultant of two collinear forces, resolution of forces, moment of a force, couple, theorem on moments of a couple, coplaner forces, resultant of three coplanar concurrent forces, theorem of resolved parts, resultant of two forces acting on a rigid body, Varignon’s theorem, generalized theorem of moments.
Equilibrium of two concurrent forces, equilibrium condition for any number of coplanar concurrent forces, Lami’s theorem. l – m theorem, theorems of moments, resultant of a force and a couple. Equilibrium conditions for coplanar non-concurrent forces.
Definition and nature of friction , laws of friction, Centre of gravity.