Excuse me, Xueba, physics has fallen too much before, and it is about to rise to grade two. What should I add?

To put it simply, learning physics well in senior high school is always divided into two steps.

First, study.

Second, do the right thing.

Let's talk about society first:

Physical physics, the principle of object motion. Physics in senior high school is a big movie, telling a story, 80% of which is about how human beings control the movement of everything in the world through force. The remaining 20% of the content is four multiple-choice questions: egg, wave, light, heat and original.

If your comprehension ability is limited, you can't fully understand the plot of the story after watching the movie. Then you might as well listen to the hill brothers to help you talk about film reviews.

The first part of the film is the prologue. When I talk about force, I tell you that force has both magnitude and direction, and I also tell you to analyze force no matter what you encounter in the future. The trick of force analysis is to say "one weight, two bombs, three friction forces" in your mind.

The first part is over.

The second part of the film is the prologue, telling you that all kinds of movements in the world are composed of four basic movements, namely, uniform linear movement, uniform variable speed linear movement, flat throwing/quasi-flat throwing movement and uniform circular movement. It also tells you how to solve a motion-equation system. Translate into the formula as shown below.

The third part of the film is climax, which is about force and motion, that is, Newton's three laws. Newton told mankind three things, which guided mankind to control the movement of everything in the world.

1, the object is at rest or moving in a straight line at a constant speed without giving it a force.

When a force acts on an object, it will accelerate, and the acceleration is a = f/m. ..

3. Don't mess around. You have to bear as much force as you exert on an object. Be careful not to lose your life.

The above tedious words are translated into concise formulas:

The above table covers 80% of the contents of physics textbooks. When I was a freshman, I learned the movements and formulas in the table above. Senior two continues to learn electric and magnetic fields. In fact, it is still the review in the above table. Senior two learned electric field, magnetic field and electromagnetic induction. Charged particles move in an electric field, either uniformly accelerating in a straight line or quasi-flat throwing. There is only one more content: the solution of electric field force F=Eq. That's all. Can only do uniform circular motion in the magnetic field, only one more content: Lorentz force F=qvB. That's all. The content of electromagnetic induction is only F=BIL, and the rest becomes the problem of the small slider learning in senior one slipping down on the inclined plane again.

What high school physics movies want to tell us is that any physical problem is nothing more than two situations:

One is to give force and solve the movement.

One is to give the motion and solve the force.

In either case, the relationship between motion and stress is established by the calculation formula in the third column of the above table.

The idea of solving the problem is: according to the meaning of the question, determine the stress or movement, and then list the corresponding formulas.

The third formula above is enough for you to solve all the physics problems in the college entrance examination, that's all.

If anyone is not satisfied, let me demonstrate the physical finale.

Is this question typical enough? It seems complicated enough. There is nothing more complicated on the physics test paper. If you can get full marks in this question, there will be nothing difficult for you in physics in the college entrance examination.

Thinking of solving problems: I don't look at the problem after reading this kind of problem, but solve the problem directly, because there is no process that I can't use.

1, in stages. 2. Column correspondence equation. 3. Solve the equation.

Write the above analysis process roughly and list the equations. You can get 90% even if you don't write numbers. Is it simple?

Note: the deflection of charged particles in magnetic field is basically not a complete circular motion. When encountering this kind of problem, the first thing that comes to mind is six words: "Find the center of the circle, find the radius". It must be like this. The knowledge used in "finding the center and radius" is junior high school geometry. If you can't work it out quickly, you must work hard in advance and sum up all the models of this kind of questions, so it will be clear at a glance when you take the exam.

As I said just now, the formulas in the above table can solve all the physics problems in the college entrance examination. However, in order to solve the problem simply, two formulas, momentum theorem and kinetic energy theorem, are introduced.

The function of kinetic energy theorem is that in complex motion, if only the result is considered and the process is not considered, it is not necessary to list all the above equations and get all the parameters. If you only care about the final speed or the final altitude, you can directly use the kinetic energy theorem.

Similarly, momentum conservation and impulse theorem also have this effect.

The story of the first hero Newton is over. Male number two comes out: Ampere.

This article is about how to solve the problem of electrical experiment.

The problem of electrical experiment is a design problem. You only need to design the circuit into three parts.

1, power supply circuit (voltage divider or current limiter) according to the requirements of the topic, grasp the key words, such as as as much measurement data as possible. ...

2. Comparison of internal resistance and resistance of ammeter in electrified circuit (internal or external).

3, meter selection (basically there is no suitable meter, so a resistor should be connected in series and parallel to modify the meter)

As long as you get the electrical experiment questions in the future, ask yourself what to choose for the power supply circuit, the power consumption circuit and the electric meter. This problem has been basically solved. The rest is error analysis. The error sources of each type of experiment are different. Summarize it yourself. If you encounter that, don't even think about it, just fill it out.

One more thing, in order to avoid many people seeing this kind of problem directly, the book gives four experimental models, which are measuring the volt-ampere characteristic curve of light bulb, measuring the electromotive force and internal resistance of power supply, measuring the resistivity of resistance wire and modifying the electric meter. All the electrical experiment questions in the college entrance examination are based on the above four models.

There is also a mechanical experiment. Take a batch of college entrance examination questions for horizontal comparison, and you will find that whether it is to verify the conservation of mechanical energy, to measure the acceleration of gravity, or something else, the final test point is the point timer. It will remain unchanged for ten thousand years. So, do ten questions about setting the timer in advance, and there will be no more problems.

The rest are tidbits and guest appearances. Mechanical wave, optics, heat, atomic physics.

These contents only need to remember the basic formula, and the college entrance examination is free.

In short, for physics, we should have an overall framework, and then constantly enrich those details. Anyway, after I formed this knowledge system, the content of high school physics, like a complete story, will never be forgotten in my mind.

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Let's talk about what to do.

Ask two questions first.

First, how many points will you lose in each exam when all subjects are "wrong"? Total * * * At least 100+

Second, have you ever asked yourself why?

I believe your reasons are very general, such as miscalculation, misreading, thoughtlessness and so on. But are you sure you really know yourself well enough?

Do you always feel that you are just careless, so you let yourself go again and again? But are you sure you are really just careless? How much is 1+ 1?

I was also troubled by these problems. Finally, every time I make a mistake, I sum it up in one sentence in my notebook. If I make the same mistake again, I will write orthography. Finally, all my mistakes can be summarized in one page. So that every time I do a straight line problem, I will think of it many times in a conditioned way and forget to consider the fact that the slope does not exist. I will naturally remind myself.

What I want to tell you is:

1, we must be highly vigilant against losing points caused by non-intellectual factors. This question is too difficult to change.

2. Be sure to fully understand your weaknesses. What is full understanding? At least like me, I know what mistakes I often make when I meet a certain step of a specific topic here. I'm not particularly general, but I know that I have problems with my calculations and exams.

It is better to teach people to fish than to teach them to fish. My overall understanding and grasp of physics was formed in the summer vacation of senior two. My family collected the college entrance examination questions of all provinces and cities in China in the past three years. I made a horizontal comparison of these problems. God, it's like finding the door to a new world. For example, I have finished all the big problems of the series in the math volume, and found that there is only one routine, that is, finding the formula of the general term and the sum of the first n terms. There are always eight kinds of questions for this routine. Just sum up eight kinds of questions, and then continue to do a series of questions will feel particularly boring.

Ok, let's talk about physics. I also use this method in physics. I can do all the questions in my sophomore summer vacation. Later, it took more than half a year to get high marks. Therefore, it is particularly important to do the right topic.

Facing the whole high school physics, first of all, don't be confused. You should have a belief: "I am confused not because I can't see the goal, but because I can't find the way to it." However, everything can be solved step by step by formulating the general line. " This also applies to life.

When you tell yourself that you want to get high marks in physics, you might as well continue to ask yourself how to get high marks.

How to get high marks?

A: Learn and do the right thing.

How to learn?

A: Mechanics, electricity, magnetic field, optics, heat, and so on. ...

How to learn mechanics?

Answer: Learn stress analysis and various sports.

How to learn various sports?

A: Learning. ...

Look at the picture and speak. In short, ask yourself layer by layer, and ask the bottom layer. This is absolutely something you can do. Don't be impetuous, don't worry. You must know your own knowledge system. Never be ambiguous. If you can summarize all the contents of high school physics in concise and clear words, then you really understand. Where the explanation is unclear, it must be an unskilled place.