What is dynamics?

The study of dynamics is based on Newton's law of motion; Newton's laws of motion are based on experiments. Dynamics is a part of Newtonian mechanics or classical mechanics, but since the 20th century, it is often understood as a branch of mechanics, focusing on the application of engineering technology.

There are two basic problems in particle dynamics: one is to know the motion of a particle and find out the force acting on it; The second is to know the force acting on the particle and find the motion of the particle. When solving the first kind of problems, we only need to take the second derivative of the motion equation of the particle, and then we can get the acceleration of the particle, and then we can get the force by substituting it into Newton's second law. When solving the second kind of problems, it is necessary to solve the differential equation of particle motion or get the integral.