Basic content of particle dynamics
There are two basic types of particle dynamics: one is the motion of the known mass, the force acting on the particle; the other is the force known to act on the particle, and the motion of the particle. When solving the first type of problem, as long as the second-order derivative of the motion equation of the particle is obtained, the acceleration of the particle is obtained, and the second law of Newton is substituted to obtain the force; when solving the second type of problem, the differential equation of the particle motion or the integral is needed.