I failed the physics exam, and it was extremely bad

Be optimistic! What is it if you fail the test once, you can still do well in the test next time, and besides, it doesn't mean anything if you fail the test this time? Isn't it!

So look at it correctly, don't be too pessimistic, but of course you can't take it seriously, take action and strive to get a good score in the next exam, since this time it has been smashed, no matter how sad you are, it will not help.

Don't be afraid if you fail the test, I'm afraid that you will be "afraid of the test". In fact, there is nothing wrong with not doing well in the exam, to put it bluntly, you are worried about what others will look at you. Sum up the experience and come back next time! The best way to appease your mom is to study hard and study hard from now on.

You should first reflect on yourself, why you didn't do well in the exam, and then learn a lesson, set a plan for yourself, and then talk to your mother well, and tell him your plan, so that he can rest assured that the plan is not an empty letter, it must be implemented. Good next time and I wish you success!

In my opinion, everyone who reads physics is very powerful, because the number of times I passed the physics exam when I was in high school can still be counted, a failure is nothing, no one does not fail, in fact, failure is the most test of people The exam is not only strength, but also depends on the mental state at the time, of course, there is a little luck, people with strength will not be afraid of failure, on the contrary, a bad test is just a test of your mental endurance and adjustment ability, whether you can check and fill in the gaps from this exam The teacher will not follow you for a lifetime, and knowing how to deal with your own mentality will benefit you for life Now, instead of thinking about whether the teacher misunderstood you, it is better to go back and see, **wrong, adjust yourself, make up for what should be made up, do well in the next exam, and prove it to the teacher, I am just in a bad state this time, the spirit is not good, I am powerful, and the college entrance examination must be more practical for the teacher to win glory

This society tests people, not only their grades, but also their resistance to pressure, and their mentality Adjust it well, so that the college entrance examination can be treated with a normal heart

I used to be very bad at physics! Not only physics, but also mathematics and chemistry are all confused! I once scored 38 points in math three times (in high school), and my classmates said, "If you do it again, it will live up to its name!"

Dead three-eight! Haha......"I was anxious all day, and I felt like I couldn't stop worrying. In fact, it's okay to think about it now, learning is just for better survival in the future, and your survival skills are not just exercised in the study of physics.

So don't be in too much of a hurry!

However, students still have to focus on learning, physics, basic things to master, such as concepts, formulas or something, practice a lot, connect with reality, and it will be much easier to grasp flexibly! Relax and keep up! I'm sure you'll make it!

Correct your attitude towards exams.

When you take the exam, you can think of yourself as doing your homework independently, and if you don't do it well, you will have a chance next time!

Because Coulomb's law only applies to point charges.

In the case you are talking about, the radius of your ball and the distance between the two balls obviously do not meet the requirement of "point charge", that is, in this case, the Coulomb force of different parts of your ball is different, and it cannot be calculated directly by Coulomb force.

In this case, you can only calculate if the charge is evenly distributed, and you can approximate the charge as concentrated in the center of the sphere, but this is not standard.

The ball is charged as a point, centered at the center of the ball.

Coulomb's law only applies to point charges, which must be observed. Since the question stem does not meet the requirements, Coulomb's theorem cannot be used. The method used in college is to use charge elements per unit area, so I don't think I learned it in high school.

In this case, let's think of these two charges as evenly distributed, concentrated in the core point charge, so that the requirements are met.

Point charges can not be used, but qualitative analysis can also be used, if the two have the same charge, the electrostatic force must be less than k*q 2 9r 2, if there is a different charge, it is less than. Because of this situation, the point load is not evenly distributed.

Read the questions well and think clearly, it will not be difficult.

I think there are several possible reasons for your situation.

One is the method. It's right to increase the amount of exercises, but it's more important to be diligent in summarizing. What you can do needs to be sorted out, and what is difficult to do or even has no ideas needs to be sorted out and summarized.

Many questions are found to be very similar to the type of questions done before, at this time, this kind of question only needs to be performed in the draft to see if it is correct, and then check the answer to see if it is correct, if it is correct, there is no need to waste too much time. As for the types of questions that you haven't seen before, you need to pay attention to it, carefully write down the calculation process, and sort out the solution ideas. Follow this method, and your physics grades will get better and better.

At the same time, it should be noted that it is best to do different body types together, such as multiple-choice questions and pen-answer questions, because multiple-choice questions have their skills, and they cannot be rigidly copied in one way, and saving time to ensure that the mind is clear during the exam is the main thing.

The second is your current state. You say your grades are getting worse and worse, I don't think so. It is very likely that the difficulty of the questions you are encountering now has increased and the types of questions are new, so you feel a little struggling.

Go back to the questions you've done before, and you'll probably find it a lot easier. With the deepening of learning and the advent of the third year of high school review, the difficulty of the questions will increase, so that the difficulty can be gradually increased to adapt to the difficulty of the college entrance examination. You are now exposed to many types of questions, and you are not afraid that you will find it difficult, as long as you have seen and done it, you will not panic during the exam, and your results will get better and better. Come on.

First of all, if you are interested in science, it is useless to do more questions if you are not interested. Then it is necessary to study the topic thoroughly, and it is better to study one question than ten questions. At the same time, if you encounter a problem, don't immediately look at the analysis or ask the teacher, you must study it yourself for a long time, if the research comes out, you will like it more, and if you don't study it, you will understand it quickly.

Let's just say that you don't understand the laws of physics well enough.

Or maybe there are some paranoid thoughts in the subconscious, and the latter point is difficult to avoid even if it is the "father of physics".

For example, Newton, although he had many great achievements in science, subconsciously believed in theology, and his scientific efforts were only to prove the existence of God.

Einstein's theory of relativity laid the foundation for modern physics, but he was paranoid about his disbelief in quantum mechanics, and he famously said against quantum mechanics: God doesn't play dice.

I made this mistake when I was a kid, don't be afraid.

The problem lies in the method of checking: the idea of checking is to repeat the idea of solving the problem, and you will definitely not find any mistakes. (Don't deny it!) ）

The correct way to check is: to do the inspection as a new question, 1. Start by understanding the meaning of the question, find out the known conditions, and whether there are any omissions to the known conditions (the known conditions will not be given to you); 2. It is best to write the unit when setting up the equation to see if the unit of the result is correct, because the unit combination in the equation contains physical concepts.

This is my lesson and I hope it will help you. Good luck!

I'm often like this, I feel right, I haven't found anything wrong with my thoughts after going through it several times, but the answer is wrong. Don't stumble in one way, try to use other people's ideas to do the problem, find the difference between the two, it may be just a calculation error, but maybe you will find a dead end in your thinking.

It's better to check it more than once.

If you do not have a solid grasp of the basics and do not have a thorough understanding of the formulas in the physics textbooks, the formulas that can be used when doing problems are not used or used inappropriately, and if you do not understand the meaning of the formulas, it is easy to use the wrong method when doing problems. There are few questions to do, and the teacher didn't understand the questions he didn't understand after he said them, and he didn't understand the physical scene of the questions very well, and he might even guess when he wrote them. All of these can lead to mistakes when doing the questions.

It is recommended to read more textbooks, remember the physics scenes in them, many formulas are produced in textbooks will say that scientists made the background reason for this formula, which is generally the application of this announcement. There is also to write more related questions, preferably those that don't seem to be well understood, but think more about the topics that can be understood and come up with a method. If you write too much, you will be familiar with what methods you can find and what physical quantities, and the error rate will go down.

I don't usually develop a serious habit.

The knowledge is not firmly learned, and the foundation is not solid.

At the beginning, there will be a little bit, and it will not be possible to learn this, many topics do not need to care about the process, and it is enough to directly study the kinetic energy theorem or something.