Which of the four mechanics do you think is the most difficult to learn? Why?

Personally, I think that classical mechanics - it is possible to speak well from a teacher who has a good foundation in mathematics and physics, knows how to teach teaching methods, and has an understanding of the frontiers of scientific research, and this kind of person almost does not exist. Let's talk about this lesson, which can make people feel as comfortable as drinking ice water on a summer day - "I see! Talking about water can make you feel that the taste is the same as chewing wax without any gain - "Isn't this just a little bit of general mechanics added to it", talking about it sounds like eating Xiang......Statistical mechanics is also troublesome, and digging deeper encompasses almost all physical ......However, for special reasons, I have studied thermodynamics and statistical mechanics three or four times (in particular, in general physics, we have received very detailed and good thermodynamics teaching, which is much better than the time of the four major mechanics).

Therefore, when I look at the statistics of the four major mechanics, I feel that the problems encountered in the course, no matter how difficult they may seem to be, are at least direct in terms of thinking. Talk nonsense again. Although there are historical reasons for the simultaneous development of the four major mechanics, it is actually a very strange thing.

Electrodynamics is a specific theory, which is the guide to classical field theory, and the remaining three are ways of thinking: the course of classical mechanics is probably the beginning of the way of thinking about physics; Statistical mechanics and quantum mechanics are themselves a set of methods for dealing with problems, rather than specific theories. More specifically, classical mechanics is actually an introduction to mathematical methods (even if you bring in symplectic geometry, the physical image is still like that), statistical mechanics is a "new idea", and quantum mechanics is a "new image".

Here's the problem. Does the department head plan to open a separate course in classical mechanics? If you don't open it separately, who will talk about the Clam Millon and Lagrange system?

Alone, classical mechanics has been developed for more than 300 years, and there is so much to talk about, but in the end it is almost impossible for the vast majority of students to engage in related work. On its own, physics students cannot compete with those who specialize in this (mostly applied mathematics). As a result, many people learn a lot of stuff half-learned.

In today's teaching, the course of classical mechanics is often talked about as "how to quickly perform calculations of a certain scale with a half-understanding", so many people actually pinch their noses to learn. <>

Lili: I think I understand completely, but no matter how I review, no matter what stage the exam score is low, there is no sense of accomplishment after learning except for the two equations: I know that I definitely don't fully understand, but the degree of my understanding is worthy of the high score I get, and after learning, I feel that I can do anything, and I feel a sense of accomplishment

I think I completely understand, but the score of the exam is random to full score and forty, I have taken it, and there is no sense of accomplishment after learning except for understanding the equation: I know that I definitely do not fully understand, but the undergraduate content can be self-consistent to *** high score, after studying, I feel that I have entered the threshold of the door of the new world, and I feel very accomplished I generally judge whether a physics course is difficult or not mainly based on the test score, the degree of self-recognition of understanding, the feeling of learning the end, and the difficulty of using this knowledge in the future. Personally, I think my physical thinking ability is stronger than mathematical literacy and mathematical imagination...

Thank you to my undergraduate teachers of Thermal, Flat and Quantum! <>

As a child majoring in materials physics who has graduated for many years, before we study "Quantum Mechanics", we talk about our courses, which are high mathematics, modern probability theory, big things, mathematical equations and physical statistics, crystallography, materials physics, magnetic materials, solid state physics, ......Then study, and then feel that this course is out of the classics, refresh the three views, the brain is completely insufficient, a course 30+ physics Nobel Prize winners, feel that mathematics is not good, never learn physics.

Quantum mechanics and electrodynamics are the hardest, and they're equally difficult. Quantum mechanics has a whole new set of operators and rules, and more conclusions and classical mechanics to the left. For example, in quantum mechanics, when the kinetic energy of the electron is less than the potential energy of the barrier, the electron still has a certain probability of passing through the barrier.

This is absolutely impossible to happen in classical mechanics, so quantum mechanics is mainly difficult to understand! Electrodynamics is part of classical physics and is relatively easy to understand. A class of problems that often need to be addressed:

Under certain boundary conditions, find the electric field, magnetic field, and electric potential" ......Its essence is to find the solution of a partial differential equation under certain boundary conditions! The complexity of the process and the amount of computation are all first-class. And sometimes you have to struggle with boundary conditions that you can't figure out, and you can't solve them.

It's a bit of a back-to-the-math physics equation. Therefore, electrodynamics is difficult to calculate! And it is precisely because of its own unique set of rules that quantum mechanics makes many integral operations so simple that the results can sometimes be seen at a glance.

Theoretical physics and thermodynamic statistical physics are relatively simple, but theoretical physics is more difficult in comparison. The simplest is thermodynamic statistical physics, I used the summer vacation to teach myself thermodynamics, solved the exercises after class and made detailed notes, and by the time the teacher officially taught, I had already finished learning.

Quantum mechanics, its operation and the correctness of the symbols are difficult to understand, even the most basic equations are constructed, without the support of classical mechanical theory, various operators replace the original classical mechanical quantities. In short, this science feels like a complete set of theories based on experimental results.

I thought I was talking about structural mechanics, theoretical mechanics, and material mechanics.

Isn't it fluid mechanics.

<> the four major mechanics of electrodynamics, fluid mechanics, thermodynamics, and quantum mechanics are all difficult.

Electrodynamics: It is a classical kinetic theory for the study of electromagnetic phenomena, which mainly studies the basic properties of electromagnetic fields, the laws of motion, and the interaction between electromagnetic fields and charged matter. The scope of people's understanding of electromagnetic phenomena is gradually expanding from special aspects such as electrostatic, magnetostatic, and quasi-stable current, to the process of general motion change.

Fluid mechanics: It is a branch of mechanics, which is the science of studying fluid phenomena and related mechanical behaviors. Fluid mechanics can be divided into hydrostatics and fluid dynamics according to the mode of motion of the object under study.

Fluid mechanics is divided into hydraulics and aerodynamics according to the scope of application.

Thermodynamics: It is a branch of natural science, which is a discipline that studies the properties of the material system in equilibrium in thermal phenomena and establishes the equilibrium relationship of energy, as well as the interaction between the system and the outside world when the state changes.

Quantum mechanics: It is a branch of physics that studies the motion laws of microscopic particles in the material world, mainly studying the basic theory of the structure and properties of atoms, molecules, condensed matter, as well as atomic nuclei and elementary particles, which together with the theory of relativity constitute the theoretical basis of modern physics.

Analytical Mechanics, Quantum Mechanics, Electrodynamics, Statistical Mechanics.

The most famous courses in the Department of Physics are the four major mechanics - quantum mechanics, electrodynamics, statistical mechanics, and analytical mechanics. These four courses are the core courses of undergraduate physics and constitute the most basic framework of the theoretical system of physics. Because of this, each course of the Four Mechanics integrates a large number of basic knowledge of mathematics and physics, which has become a nightmare for physics students because of its extreme difficulty.

Sometimes, a question has to be deduced for several pages, and even more than ten years after graduation, some department members still can't forget the fear of being dominated by the four major mechanics, especially the pain they have experienced in the electrodynamics exam with their own dry food until the school building closes.

Chemistry does not involve the nucleus, only the deflection and transfer of electrons outside the nucleus, and it involves the increase and decrease of the potential energy of the electrons. Nuclear physics, the changes inside the nucleus, do not involve electrons, but involve the nuclear force in the nucleus, which belongs to the strong interaction force, whether it is nuclear fusion or nuclear fission, it will change the number of protons in the nucleus, that is, the elements will change to generate new elements.

Quantum mechanics is a fundamental study of the physical phenomena of wave-particle duality of microscopic particles, any particle is both a particle and a wave, and the probability theory of microscopic uncertainty to macroscopic determinability.

You sayMajor in Engineering MechanicsBar, mechanics of materials, theoretical mechanics, elastic mechanics, structural mechanics, in generalFluid mechanicsThe hardest.

Fluid mechanics is the most difficult, and material mechanics is the easiest. The mechanics of materials is relatively simple, the variables are not large, it is relatively basic, it does not require very esoteric mathematical knowledge, and the theoretical system is relatively complete. Theoretical mechanics lies in the understanding and flexible handling of the examination room, which is more difficult than material mechanics, but simpler than fluid mechanics.

There are many kinds of fluid mechanics, there are engineering fluid dynamics, advanced fluid dynamics, computational fluid dynamics, multiphase fluid dynamics, etc., advanced fluid dynamics is the basis of computational fluid dynamics and multiphase fluid dynamics, which requires a very solid mathematical foundation.

In addition to higher mathematics.

In addition, tensors are required.

If the mathematical foundation is weak, it is difficult to learn advanced fluid mechanics.

There are generally four types of mechanics studied in college: theoretical mechanics, electrodynamics, quantum mechanics, and thermodynamics and statistical physics

Theoretical mechanics is a branch of mechanics that studies the basic laws of mechanical motion of objects. It is the basis of all branches of ordinary mechanics. Theoretical mechanics is generally divided into three parts:

Statics, kinematics and dynamics. In fact, objects in theoretical mechanics mainly refer to mass points, rigid bodies and rigid body systems, and when the deformation of objects cannot be ignored, they become the objects of discussion in degenerative mechanics. Statics and dynamics are the main components of engineering mechanics.

Electrodynamics sleep oh classical dynamics theory, it is also known as classical electrodynamics, is the abbreviation of electrodynamics. It studies the basic properties of electromagnetic fields, the laws of motion, and the interaction of electromagnetic fields with charged matter. By far the most complete, deep, and extensive understanding of nature is electromagnetic interactions.

It has a higher foothold than the electromagnetic field problem, and the mathematical basis applied to it is more difficult, the theory is stronger, and the discussion is more in-depth and universal.

Quantum mechanics is a physical theory that describes the atomic and subatomic scales. This theory was formed in the early 20th century and revolutionized people's understanding of the composition of matter. In the microscopic world, particles are not billiard balls, but buzzing probabilistic clouds.

Not only do they exist in one location, but they do not reach point B through a single path from point A [1]. According to quantum theory, particles usually behave like waves. The Wave Function used to describe the particle's behavior is a particle's possible characteristics, such as its position and velocity, rather than certain characteristics.

Some strange concepts in physics, such as the principle of entanglement and uncertainty, have their origins in quantum mechanics.

Thermodynamics is the study of the basic theories of atoms, molecules, condensed matter, and the structure and properties of atomic nuclei and elementary particles. From the macroscopic theory, it can be concluded that the transformation of energy into matter mainly comes from the macroscopic thermodynamic theory.

Statistical physics is a branch of theoretical physics that uses the methods of probability theory and statistics to explain the physical properties and macroscopic laws of macroscopic objects composed of a large number of particles. Also known as statistical mechanics. The so-called large molecular weight is based on the number of molecules contained in the molar substance (on the order of 10 23).

The professional mechanics in the university is close to the reality of engineering, but it is still an extension of Newton's laws.

Thermodynamics is a discipline that studies the properties of thermal motion of matter and its laws from a macroscopic perspective. It belongs to the branch of physics, and it and statistical physics constitute the macro and micro aspects of thermal theory, respectively.

Thermodynamics is mainly the study of the thermal properties of matter from the point of view of energy conversion, which suggests the macroscopic laws that energy follows when converting from one form to another, and summarizes the thermal theory obtained by summarizing the macroscopic phenomena of matter. Thermodynamics does not investigate the microstructure of matter composed of a large number of microscopic particles, but only deals with the thermal phenomena that the system as a whole and the basic laws that must be followed for their change and development.

It is content to describe and determine the state of the system with a few macroscopic state quantities that can be directly felt and observed, such as temperature, pressure, volume, concentration, etc. Through a large number of observations and experiments on thermal phenomena in practice, it is found that there is a relationship between macroscopic state quantities, and their changes are mutually restrictive.

In addition to the properties of matter, the constraint must also follow some basic thermal laws that are applicable to any substance, such as the zero law of thermodynamics, the first law of thermodynamics, the second law of thermodynamics, and the third law of thermodynamics.

Thermodynamics is based on the above basic laws obtained from experimental observations, applies mathematical methods, and through logical deduction, derives the relationship between various macroscopic properties of matter and the direction and limit of macroscopic physical processes.

Define state functions:

On the basis of the concept of equilibrium state of the system, thermodynamics defines three state functions necessary to describe the state of the system: thermodynamic temperature t, internal energy u, and entropy s. The zeroth law of thermodynamics lays the foundation for defining and calibrating temperatures;The first law of thermodynamics defines the internal energy of the state function;The second law introduces the entropy of the state function and the thermodynamic temperature scale;The third law of thermodynamics describes the properties of the internal energy and entropy of a system near absolute zero.