Dear students and friends, I sincerely ask for advice, how to learn physics in high school, I am in

Clause. First, listening to lectures is a must, when you are just in contact with the first time, there may be some things that you can't understand at one time, some may be very abstract, after class, you have to repeatedly ponder some truths and phenomena, and ask questions in time if you don't understand.

Clause. 2. Physics is not mathematics, mathematics is pure logic or extremely abstract models. Physics is close to reality, solving physical problems is easier than solving mathematical problems, and sometimes practical thinking can be very helpful.

Clause. 3. Physics is not mathematics, and the sea of questions is useless. As long as you understand the truth and memorize the formula, it can be said that it is very easy to draw inferences over and over again, and there is no need to do a lot of questions, and the sameness can only delay time.

Fourth, most of the complex problems in physics are also relatively abstract, you just need to remember that all the steps of solving the problem must have his reason, and the analysis of each step is well-founded, and often step by step, do not panic, trust your own mind.

It is very, very important to listen carefully in class! Then do more exercises, compare your own problem-solving ideas with your answers, and be sure to figure out what your method is wrong with!

The important thing in high school physics is interest and modeling, the teacher talks about the basic models must be mastered, the questions are pieced together from those plates, practice more questions, at least 5 multiple-choice questions and 2 big questions every day, persist for 3 months, you will find that some questions can be made after reading the questions, at this time your physics is considered to be on the next level.

Very simple... It's about thinking about the questions you don't know when you're fine.,No matter what time it is.。。。 I just always come up with the answer when I'm eating or squatting on the toilet.

Just don't sleep in class.

It's useless to talk too much, do more questions.

i=nevs=n (sl)*evs=nev li=nevs is the calculation of current, n is the density of the charge body, e is the basic charge amount, v is the velocity, and s is the cross-sectional area.

Then, n is the total number of electrons and l is the circumference.

Substituting the data yields n=10ILec=5*10 8

First of all, you have to have confidence in yourself and tell yourself that you can do it.

Try to prepare for the class as much as possible, and you can also look at various reference books and tutorials. Make some comments on what you don't understand, and wait for class or ask the teacher separately after class.

You must listen carefully to the lectures, and you must handle the relationship between listening and memorizing, even if you only listen and don't remember. If you encounter something you don't understand in class, ask questions in time to avoid being left behind, and don't be afraid of being embarrassed.

For the class, in addition to reviewing the textbook again, teaching the textbook from seeing clearly to understanding and then forming a framework, it is necessary to carefully complete the homework assigned by the teacher. In the same way, dare to question where you won't and ask without shame.

Physics is to understand reason, and if you only stay at the level of rote memorization, you can only get worse and worse; When you encounter something difficult and you don't understand, think about it yourself, you must calm down and think about it, and even force yourself to think. If you really can't think of that question, just record that it is stuck in **, and then go to ask for help, so that targeted learning is much more useful than swallowing dates.

Don't be frustrated if there are a lot of questions you won't be able to do. First, it may be true that you do not have a firm grasp of knowledge, sometimes, the topic will be transferred from simple knowledge, if the change of thinking is not very strong, it is recommended to look at a bibliography similar to the complete interpretation of the textbook; Second, it may be that the topic you choose is too difficult, don't think that you can easily challenge the topic after studying for a few hours, and even the teacher has to think about it for a long time.

In addition, attention should be paid to frequent review, frequent reflection, and frequent summarization. This is an area that is easily overlooked. After learning a lot of knowledge, you need a little time to "classify" the knowledge you have learned, which is also an important stage for improving your ability and building a system.

Finally, remember: there is nothing difficult in the world, only those who have a heart.

I wish you more and more joy and better in your physics studies.

I was very poor in physics in my first and second years of high school, and I got better after a round of review in my third year of high school, and it was mainly a matter of understanding, and at that time, my first and second years of high school were completely incomprehensible, and I practiced a lot in my third year of high school, and I had to understand a lot of things in the book, and there were many skills in physics, like circuits, and I had to do a lot of tricks, and even though I forgot what the content was, it was still useful, and there was something with a little bit of particle motion in the compound field, and if you did more, it would get better, take your time, and don't rush this The multiple-choice questions are the key to the college entrance examination, so make sure that you understand what you are learning thoroughly In this way The exam only needs to memorize the formula, it is not difficult, and I wish you good luck

Write down the formula, and then draw a diagram as soon as you encounter a problem about mechanics, and solve it in combination with force analysis.

The first is, of course, to memorize the formulas, and then to memorize the concepts in the book, my physics teacher said that you can only understand and find the clue when you memorize all the questions. It's best to go through all the concepts in the book yourself. It is important to do more exercises, especially geometric force analysis

First of all, interest is very important, cultivate interest first, such as watching the technology channel. In addition, imagination and comprehension are also necessary qualities, but this is not something that can be cultivated in a day or two. In the end, it's time to work hard, don't die to learn.

Formulas should never be memorized based on understanding.

Solution: The particle moves in a magnetic field in a uniform circular motion, the incident point is S, the exit point is on the OC line, and the line between the exit point and the S point is a chord of the trajectory

When the particle emitted from the boundary OC moves in the magnetic field for the shortest time, the chord of the trajectory is the shortest, according to geometric knowledge, as es OC, then es is the shortest string, and the time from S to E of the particle is the shortest

According to the question, the minimum time for particle motion is equal to. t

then =60°

Let os=d, then es=

d From the knowledge of geometry, the radius of the trajectory of the particle motion is r=es=d, and the diameter d=

Therefore, choose B <>

When a capacitor is connected to a DC circuit, it can be regarded as an infinite resistance (open circuit), so the resistance is still infinite when connected to R3, and the current on the resistance R3 is always zero. The change of R3 does not affect the voltage at both ends of the capacitor, so CD is excluded;

Therefore, the capacitor is connected in parallel with R2, when R2 increases, the voltage at both ends of the capacitor increases, and the charge Cu increases.

Increase R1 so that the current on R2 decreases so that the voltage at both ends of R2 = the voltage at both ends of the capacitor decreases, and the amount of charge decreases, so A is wrong.

If option A is correct, "At this time, the particle m is moving in the positive direction of the y-axis", then the particle M will reach the maximum displacement in the positive direction of the y-axis for the first time after 1 4 cycles, and then reach the maximum displacement in the positive direction of the y-axis every other cycle. Therefore, when the particle M reaches the maximum displacement in the positive direction of the y-axis for the seventh time, it has passed (6+1 4) cycles, that is.

Then, the wavelength is obtained from the waveform diagram, and the wave velocity is obtained according to the wavelength and period.

Option b is correct, with "At this time the particle m is moving in the positive direction of the y-axis", the direction of propagation of the wave: right. The simple harmonic is exactly propagated at x= as shown in the figure, and the particle is about to vibrate (in the negative direction along the y-axis).

Each particle is a form of vibration of a repeating source, which vibrates in the negative direction along the y-axis, so the source vibrates in the negative direction along the y-axis.

Option c is wrong, the period of the wave is t=, according to the reciprocal of the period and frequency, the frequency of the wave is 5 Hz, and the two series of coherent waves with equal frequency can have stable interference.

option e is correct. 0—— It is exactly 6 cycles, and the distance traveled by one cycle is 4 amplitudes, and 6 cycles is 24 amplitudes, that is, 240cm.

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