Dynamics is a branch of theoretical mechanics, which mainly studies the relationship between the force acting on an object and its motion. The research object of dynamics is a macroscopic object whose moving speed is much less than the speed of light. Dynamics is the basis of physics and astronomy, and it is also the basis of many engineering disciplines. Many mathematical advances are often related to solving dynamic problems, so mathematicians have a strong interest in dynamics.
General theorem of dynamics
The general theorem of dynamics is the basic theorem of particle system dynamics, which includes momentum theorem, moment of momentum theorem, kinetic energy theorem and other theorems derived from these three basic theorems. Momentum, moment of momentum and kinetic energy are the basic physical quantities to describe the motion of particles, particle systems and rigid bodies. The relationship between the force or torque acting on the mechanical model and these physical quantities constitutes the general theorem of dynamics.