The semi finals of the high school physics competition are imminent, and experts from all walks of l

Are you going to participate in the semi-finals of the Olympiad?

I participated. It made me take the test for the only time in my life in the single digits.

I never got that paper right, and when I looked at it, I was scared on the spot.

What rolls? Seven questions, some 15 points, some and 20 points, I forgot that there are more than 100 points in total.

A question will allow you to write several pages.

Maybe it might be nice to scare you first. The roll. I can't say.

It was the only one in the city that made it to the semi-finals, but the only time I made it to the single digits. Not the last one though.

You don't need to study celestial bodies, so what's the use, and will physics competitions test your general knowledge?

Definitely a ladder of IQ.

If you don't practice that kind of problem, you can't do it at all.

And none of our teachers here can explain the questions clearly, and I have never seen such difficult questions.

It's hard to find on the Internet, and a more difficult competition question I read on the Internet more than a month ago. Or computer typing went up.

And the question of the semi-final is now for me to do, two words, no.

It's very simple for your question, be prepared for everything. It doesn't matter if it's 0.

Maybe your ordinary heart can be overcome, thank you.

The contest is more about skill and extension. This means that it is difficult to represent the physical model of the problem with existing formulas, because you don't know the deeper laws of physics, or the more advanced mathematical tools.

If possible, first consolidate the physical models corresponding to all physical formulas, and know the derivation relationship between them; Then learn about the physical applications of calculus, such as near free fall, where drag and velocity are in a certain relationship, and how to solve the equations of motion.

In short, the significance of the competition is to restore the discovery process of physical laws, and the better the physical thinking, the easier it is to get high scores.

Writing nothing, just writing a name is also rewarding, haha.

The scoring trick is to improve your cognitive level, and if you can't do the questions, you have to solve them with a different idea.

I'm going to ...... tooI'm going to Shanda tomorrow......Hang out ...... onlineCompetitions need to be prepared early, and I've only been learning them for a little over a year.

If you only eat the textbook thoroughly, I can tell you in charge that there are no awards, and there is no way to win the third prize.

The rematch is something that takes a long time to practice.

The question of celestial bodies must be in hand, the easiest, every year, four years.

There are only a few formulas, and there are not many changes.

If you can get a few points for other questions, it will be very stable to get 30 points.

It's absolutely fine to be third-class or second-class.

If you want to experiment, fight for ......

...... from my personal experienceYour situation ......Difficult!

It's not that you don't want to get into the lab, but because:

Even if you are admitted to the experiment, it will be super difficult for you to get the experimental score, and you will not be able to get the experimental score ......That's miserable, our school used to have a written test that saved 8, but the experiment scored 0 points, and the result was tragic......The first ...... of the second prize

A word of advice: understand the situation and recognize the reality.

Seriously, unless you learned from a young age, otherwise, the forty points of the experiment are not good, and those seven hours are quite difficult!

I've also entered the semi-finals, and I don't know what questions will be tested in the semi-finals? Can someone provide us with the following information about the semi-finals? It seems to be divided into theory and experiments in the morning and afternoon, and the registration fee of 200 is 200, so please help.

There's really nothing to make up for in the immediate battle = = It's better to adjust the state.

The frequency of celestial questions is not very high, and the method itself is also very simple, so it doesn't need to be attacked much;

If you have time, relax more and adjust your mentality; I think it will be enough to look at the questions I have done wrong in the past, review some common ways to solve them, and give my best performance in the exam.

Competitions are very difficult, and it takes a lot of time to learn and study to win awards.

The National Physics Competition for Middle School Students (known as the Chinese Physics Olympiad, abbreviated as Chinese Physics Olympiad, abbreviated as CPO) is a mass extracurricular discipline competition sponsored by the Chinese Physical Society under the leadership of the China Association for Science and Technology, and voluntarily participated by all provinces, autonomous regions and municipalities directly under the Central Government.

The activities are agreed and supported by the Ministry of Education. The purpose of the competition is to promote middle school students to improve their initiative and interest in learning physics, improve their learning methods, and enhance their learning ability. Promote the school to carry out a variety of physics extracurricular activities to enliven the learning atmosphere; Identify adolescents with outstanding talents so that they can be better nurtured.

Any subject competition is very difficult, I retired from the competition in high school, my classmates have international physics, mathematics competition gold medals (imo, ipho) throughout high school I didn't see much of them on vacation, not a few days of winter and summer vacations, I don't know if there are two months.

There is no doubt that competition requires talent, foundation, and good coaching. But in fact, what is needed most is to work your own and need to be conscious. Interest is also very important, it is very boring to repeat reading books and brushing questions every day, and many people, including me, have lost their initial interest and quit.

As for the method, the coach (that is, the competition teacher) will guide you to learn step by step, and in the later stage, the teacher can't help, so you have to rely on yourself to read books and comprehend. Remember, discuss with your classmates who are competing with you, and discuss with your teachers to develop ideas.

It is necessary to learn some mathematics (advanced mathematics) knowledge in advance, which is conducive to problem solving.

How to say it, it depends on which province you are in.

It's a sprint race (but there are experiments). The experiment has to be in the semi-finals, and the scope is given, and there will be an official outline (so you will naturally have this if you enter the semi-finals, so you don't have to buy it yourself).

The full name of the sprint competition is "Higher and Better Physics - Sprint National High School Student Physics Competition".

The second edition is blue.

The third edition is white with a CD, but the content is really similar to the second edition.

It's the same which one to buy.

Each section is a method of thought example exercises, and the answers are detailed.

There are two best features of this book.

1 The topics are divided according to the method, which is especially suitable for improvement, and the problem solving is very flexible, you will know it when you read it.

2 The level of mathematics is not very high, and it uses the calculus method instead of calculus (of course, if you know calculus, of course, it is better; Although the calculus method is a bit troublesome, the calculus method has step by step points during the exam, and there are no points for calculus errors. So ......Huh).

One more thing to mention to you:

If you want to learn systematically, with a bit of general taste, I recommend the "Cheng Shu" of the University of Science and Technology of China; In addition, "Gao Miao" is divided into topics according to methods, and you can find another book that is divided into topics by module, such as "Peiyou Tutorial" or Fan Xiaohui's black and white (the above are all famous books, you can search for them).

Also, don't do those miscellaneous books for competition books, and for good books, two are enough.

It's better. It can be used as a textbook for regular classes, and of course it can also be used as a "sprint competition", after all, there is a difficulty. According to the chapters, I remember that there are more than 40 lectures.

At the beginning of each lecture, there is an introduction to the method of thinking, followed by example questions, and then a dozen homework questions, and its answer analysis is very detailed, which is the main reason why I recommend it.

Blue, Zhejiang University Press, if you buy it now, it must be the latest edition.

I remember that the one I used seemed to be a blue one.,I'm not sure how many editions I'm going to have a competition.,It's recommended that you take a look at the college physics book.,It will be helpful.。。

I use the second version, the blue one, the example questions, the exercises are analyzed, and the explanation and example problem analysis are very specific.

Didn't get it, lay it flat? Upside down? Horizontal velocity at the center of the circle? Can I draw?

The physics competition is an expansion of the high school textbook, and each chapter is more in-depth, "High School Physics Competition Training Course" and "Higher and Better Physics, Sprint to the National High School Physics Competition", these two books are very good.

However, it is really difficult to study on your own without the guidance of a teacher, after all, the textbook and the competition are not at the same level, and you can read the compulsory 2 in the 5-day self-study class, but you may not be able to master the chapter of the competition.

Go buy General Physics. 、

It's my choice. I'm only a freshman in high school.

It should be noted that the rotation of the drum has no effect on the velocity of the cylinder C, because the friction generated by the rolling is perpendicular to the velocity direction of the cylinder's motion.

sinβ=(a/2)/(r+r)

So cos = the square of [1-(sin)] under the root sign and finally substitute cos into the formula in the diagram to get f, I won't simplify, it's too difficult to express (and I don't want to redraw the diagram.) ):p

A and B cylinders are rotated or reversed.

If you don't use calculus, you can do this:

Let the lower end of the rope be pulled off where δl is required

Heavy objects, etc., drop δl 2

The rope on the wheel also drops δl 2, and there is a section of rope that is raised, and the gravitational potential energy of the rope that is pulled off has a δl square term.

The rope that is pulled off does negative work fδl

Then MgδL2+(mg L)δL*ΔL2+(mg L) RδL2-(mg L)δL*R=FδL

So be it, get the δl out.

The tension t=mg2 at the lowest point c on the rope

Analyse; The tension of the rope is equal everywhere when the self-gravity is not considered, and the gravity below the force point must be added when the self-gravity is considered. Since point C is the lowest, there is no effect of gravity below.

Is it a freshman competition? It seems to be a different region.,Why haven't I seen this kind of competition question?。。。 I checked the tension problem, and most of them said that giving tension is the balanced tension, so it shouldn't be difficult to find...

The tension of the rope in high school physics refers to the tension of the rope. Since the tension in the rope is equal everywhere, you just need to find the tension of the rope. It should be M.

I did a physics competition problem in high school, but I didn't do it at the time. Now I can learn high mathematics and use high mathematics to solve it, but I did this problem in high school, and I have recently thought about the solution, you see if this method works: assume a.