Mechanics is an independent basic discipline, involving the mechanical properties of force, motion and medium (solid, liquid, gas and plasma), macro, micro and micro. It studies mechanical motion and its coupling with physical, chemical and biological motion. Mechanics is not only a basic discipline, but also a technical discipline. It studies energy and force and their relationship with the equilibrium, deformation or motion of solids, liquids and gases. Mechanics can be divided into three parts: statics, kinematics and dynamics. Statics studies the balance of forces or the static problems of objects. Kinematics only considers how an object moves and does not discuss its relationship with force; Dynamics discusses the relationship between the motion of an object and the force it receives. Modern mechanical experimental equipment such as large-scale wind tunnel and water tunnel is a comprehensive scientific and technological project in itself, which needs the cooperation of many types of work and disciplines.

Mechanics is a science that studies the laws of motion of matter machinery. There are many levels of natural matter, from the cosmic system, macroscopic celestial bodies and conventional objects, microscopic particles, fibers and crystals, microscopic molecules, atoms and elementary particles. Generally understood mechanics focuses on the study of natural or artificial macroscopic objects. However, due to the mutual penetration of disciplines, it sometimes involves objects and related laws at all levels, whether at the cosmic level or at the microscopic level. Mechanics, also known as classical mechanics, is a natural science that studies the deformation of normal-sized objects under stress and the movement process with a speed much lower than the speed of light. Mechanical movement refers to the position change of matter in time and space, including movement, rotation, flow, deformation, vibration, fluctuation and diffusion. Balance or stillness is a special case. Other forms of material motion include thermal motion, electromagnetic motion, atom and its internal motion and chemical motion. Force is the interaction between substances, and the change of mechanical motion state is caused by this interaction. The state of rest and motion is unchanged, which means the balance of various forces in a sense. Therefore, mechanics can be said to be the science of force and (mechanical) motion.

The main theory of mechanics

1. Three laws of motion.

2. D'Alembert principle

3. Analytical mechanics theory

4. continuum mechanics theory

5. Basic theory of elastic solid mechanics

6. Basic theory of viscous fluid mechanics