The basic engineering discipline is engineering mechanics, which  describes the motions of bodies and the forces associated with these motions. 

Engineering mechanics investigates the equilibrium of forces  as well as the resulting components’ stresses and deformations. 

In conjunction with the basic fields of materials science and  machine elements, engineering mechanics provides fundamental calculation methods for creating engineering designs. Consequently, engineering mechanics should be understood as a bridge between theoretical knowledge and practical implementation, without which an understanding and comprehensive analysis of complex technical systems would not be possible.