Mechanics is a science that examines the response of materials under forces. Mechanics involves fundamentals of many engineering science and it can be said that it is the first of positive sciences.  In addition to mathematical desirability as a mathematical discipline, because of both achievement of explanation on various natural events and the huge contribution on development of technology, it has a great effect on way of thinking of the western worlds and play a principal role on systematic development of science at 20^th century.