Define dynamics?

Hint:This question is pretty basic and from the topic Motion. All you need to do is to think about what you did in this topic and what is the basic process and considerations of solving the problems on this topic, that is basically what dynamics is.

Complete step by step answer:
We will be approaching the solution to this question exactly as we told in the hint section of the solution to the question. Firstly, let’s have a look at what we did in the problems of the topic Motion.
We studied and solved questions concerned with the motion of physical objects and its relation to physical factors affecting them like, mass, force, acceleration, momentum, energy, etc. We will use this to help us define dynamics. So finally, we can say that:
Dynamics is the branch of physics developed in classical mechanics concerned with the study of forces and their effects on motion along with effects of various physical quantities like mass, energy, etc.
Dynamics studies how a physical system might develop or alter over time due to various factors and study the causes of those changes. Newton established the fundamental physical laws which govern dynamics in physics. By studying Newton’s system of mechanics, dynamics can be understood much easily and efficiently. In particular, dynamics is mostly related to Newton's second law of motion. Generally, all the three laws of motion are taken into account because they are interrelated in any given observation or experiment.

Note: In face, there are various types of dynamics like Linear dynamics, Rotational dynamics, Flight dynamics, Fluid dynamics, Aerodynamics, etc. Since the question isn’t asking about a particular type of dynamics, we are supposed to answer about dynamics as a whole and not just a subsidiary of dynamics.