Tapping the energies of nature, building machines and transportation are important mechanical engineering activities required to meet diverse needs of mankind. That is why every engineer, whatever, may be its branch, has to have basic knowledge in Mechanical Engineering. To meet this requirement, all the universities in India/ abroad prescribe a core course in principle of mechanical Engineering. This course forms a core subject which is taught to first year students of all disciplines of engineering in all technical institutions. The text and literature, contains a collection of valuable ideas/ views, is the outcome of the distillation of the available text books written by distinguished authors.