I don t know anything about physical chemistry, how to better understand the formula, how to better

I used to be like this in the first year of high school, and now in the second year of high school, when I continue to learn new knowledge, I will think of the previous content, and I feel that it is not so difficult, any formula has a cause and effect, practice makes perfect, if you really don't understand, go to a cram school, and you can't understand the formula by yourself, you can repeat it through the teacher's repeated emphasis over and over again, and you can use the simple classic questions that use the formula to do it over and over again, and then you can do some comprehensive problems.

If you really can't remember the concept of the formula, copy what you have recently learned in a small notebook, and wait in line to take it out and memorize it every day before doing exercises.

For the content that has just been taught in class, don't think that you understand it at that time, you should take out the homework in time, do some basic concept questions, and repeat it in time, otherwise if you only memorize it once in class, you will forget it after a few hours, and it will be difficult to grasp it when the time comes, resulting in the inability to understand how the teacher deduces the formula in class.

If you don't understand the class at that time, you should run up and ask the teacher after class, just ask if you don't understand, pretend to understand, and as a result, you will suffer a big loss if you make a lot of mistakes in the exam homework.

Listen carefully to the lectures, do more questions, practice makes perfect. I'm also very poor at physics and chemistry.

Treat physical chemistry as life and feel it with your heart.

Memorize the formulas and rules first, and then do the questions appropriately, and ask the teacher in time if you don't understand.

Are you talking about physics and chemistry or physical chemistry?

Again, do more questions, get an experience through a large number of question bank training, and know how to use it when you see the questions.

When you see the conditions, you don't know what to use. When doing the problem, list all the known conditions and positional conditions, and then think about their relationship, at the beginning, you can list all the formulas, including the basic and derivation, and then filter out the useful ones, and over time, you can not need to list all the cumbersome ones, and you can know what formula to use when you see the problem very sensitively.

Of course, in addition to doing fewer questions, the most important thing is that you have mastered the formulas and knowledge points on the surface, but in fact, you don't understand why this is the case at all, just stay on knowing the knowledge points and formulas, you have to deeply understand why this is the case, and think about the overturned formulas yourself, and deduce the formula through the relationship between units.

It's easy to get confused when studying physics, so it's easy to make mistakes or misunderstand.

The key is that you must understand the prerequisites of each formula correctly, whether it is a physical definition or a law, you must pay attention to the preconditions before you can apply the formula.

In addition, in terms of electrical direction and mechanics, when you start the analysis problem just now, you should pay attention to distinguishing different states, for example: a circuit with a sliding rheostat, there are two different states before and after the sliding varistor, and the physical quantities in the circuit (except the power supply) will change.

Another example: mixed series and parallel circuits, when Ohm's law is used, it is necessary to distinguish each branch clearly, and start the analysis from the simple branch.

Anyway, if you don't memorize the formula, you still have to understand the formula correctly, especially the prerequisite for the formula to be true.

It is important that you first memorize the formula. Second, no matter what problems you encounter, you should divide the problems one by one and treat them as small questions. Do one and then the next so you don't feel messed up and at the same time boost your confidence.

However, this is a need to grasp the example questions at ordinary times, and you must understand the example questions.

Okay Take your time, this is a process where you can make perfect, don't rush.

In fact, formulas can not be rote memorization, such as power formulas, there are many, the key is the topic of known information, in order to choose, at the beginning, you can list them all, and then look at the formula, choose. Do more questions and get used to it. Formulas are all about understanding.

First of all, you can look at the detailed answers to various questions to a certain extent, and in the process of looking at the answers, you should pay attention to the disintegration of the answers, that is, what conditions the answers go through, and what formulas to use, and don't care too much about ......the details

Physics learning, at least before college, still attaches great importance to routines, and all kinds of question types have fixed solution routines, which do not need to be completely innovatively solved.

So it's important to be well-informed, ......

The second is to do the problem by yourself, if you really don't know how to use it, then the first step is to break down the problem first.

List the known conditions in the format "letter symbol = value", and list the required parts in the form "letter symbol = ? ”

Then think about the general aspects of this problem, whether it is kinematics, mechanics or energy conversion, or circular curve motion, ......and so onThe general picture is always visible.

After seeing the aspect, write down the formula for the aspect that you remember on the scratch paper.

Then look at the known conditions to substitute each formula, whether you can get which of the required terms, or you can list the equation to solve ......

When I say this, you must think that it is effortless to say casually, but it is really not going to be such a process.

Another aspect of problem solving is drawing, which is very important and important.

The force analysis diagram, motion diagram and the like, the mercury height of the gas pressure, the force at each point of the rotating body and the force arm of each force arm, and the circuit diagram after simplification ......

Don't skimp on scratch paper, draw a bigger ......Represent all kinds of data ......Very useful, really useful......It will inspire a lot of possibilities for yourself.

Finally, it is necessary to summarize, finish a question, don't rush to do something else, see what your thinking is in this question, the type of question and a general feeling, and what formula is used, remember this feeling, and your intuition will become more and more accurate in the future.

The team will answer for you.

For physics, formulas are more than just formulas. To be proficient, you need to understand the meaning of the formula and how the deformation formula changes from the original formula. For example, the formula for finding the displacement of a homogeneous accelerating object in Niu Er, s=vt+ at, is actually deformed by the sum formula of s=vt and a mathematical equal difference series.

You can also see the meaning and correctness of the properties and formulas of physical quantities through the units of physical quantities.

Familiarize yourself with the knowledge points, simulate the motion process of the object in the question in your mind or on paper, and then decompose and simplify it into the physical motion model we have learned. For example, the flat throwing motion is a straight line with a uniform velocity + free fall, and the formula is nothing more than those Niu Er formulas that can be solved.

ps: When doing the problem, you can circle the physical quantities given in the question, see what physical quantities can be found by linking them, connect the physical quantities that can be found with the problem, and clarify what the required physical quantities need to be calculated to get them. ）

Physics, for some abstract things must be understood with specific things, such as mechanical vibration image and mechanical wave image can be understood by the relationship between camera and photography, you must have a set of understanding methods suitable for yourself, and you must learn to understand each other with the knowledge of different chapters, and then you must remember the formula, which can be used to be familiar with the formula, and the physics problem must learn to classify the question type, and the direction, steps, and traps of each type of question type must be familiar.

Multiple choice questions Fill-in-the-blank questions are the mastery of basic knowledge Not only formulas To memorize the basic knowledge and be able to use it, the test foundation accounts for 60% This will be written and passed.

The big question is to understand what kind of problem type it is, what method we use to solve this type of problem, and what formula to apply for this type of problem, for example.

This is a mechanics problem, and we have to think about mechanics, we have to solve the problem using Newton's second law, we have to analyze the forces on an object, we have to know what we want, we have to ask for something, and we have to apply the formula.