Mathematics and physics in the second year of junior high school, physics or mathematics in the seco

Mathematics in the second year of junior high school is more difficult, but physics in the second year of junior high school is very simple, so everyone must be mentally prepared before entering the second year of junior high school. Many students think that physics is a completely new discipline, and they have heard that there are many formulas in physics, so they have a congenital fear of physics. This kind of psychology is actually not necessary, because it is very easy to come into contact with physics at the beginning, as long as you spend a little effort to master most of the knowledge points, if you are willing to spend some time to study after class, I believe that this subject can be well mastered by everyone.

In fact, the most important thing in physics is to learn some formulas and the flexible use of formulas, because physics is learning several relatively large plates. There are different aspects of knowledge in these sections, so you just need to integrate them. And the introductory physics is not difficult at all, you just need to follow the rhythm of the teacher, I believe that most people can learn physics well.

Don't be afraid of physics from the beginning, this kind of subject is often the more afraid you are, the worse you learn, so you should have confidence in yourself. <>

The subject of mathematics does increase in difficulty after reaching the second year of junior high school, because in the second year of junior high school, everyone may be exposed to very difficult geometric aspects. And there are more and more things to learn, and students need to use a lot of auxiliary lines when learning these contents. There are many students who don't know where to start when using the auxiliary line, which is also the most difficult part.

But as long as you can take these things apart and break them down, you will find that this is actually an easier part, so it is not difficult to overcome the difficulty of mathematics as it increases. Therefore, I hope that the students in the second year of junior high school must face these subjects with the right attitude, do not feel afraid when studying physics, and strictly follow the teacher's plan when learning mathematics.

First of all, you have to build your interest, and then you have to do some simple questions to give yourself confidence. If you don't understand, you have to ask questions, and if you don't understand, you just need to understand what you don't understand. Good luck.

Physics, 1, theorems, laws must be remembered.

2. Circuit analysis.

3. Organize all the formulas and deduce the formula conversion between the various quantities.

4. Practice more. 5. Experiments (mainly voltammetry to measure resistance).

Chemistry, 1, Element Symbol.

2. Valency, according to the valency to determine the chemical formula. The valency is determined according to the chemical formula.

3. Chemical equations.

4. Remember.

5. Solution calculation (solubility calculation. Calculation of solute mass fraction) 6, chemical equation calculation.

7. Acid and alkali salts.

8. Experiments. That's all there is to it, there is a lot of content, these are basically understood, and the rest depends on memory.

Hope it helps.

Hello, I'm also in the third year of junior high school, I'm okay to learn, I have a little experience, I hope you I don't advocate memorizing much, if you don't understand, it's useless to memorize it.

Physics is in the third year of junior high school, and it's a bit abstract So you have to think properly, of course, in combination with the concept, which is conducive to your understanding and memory of the concept, or you can read the book and look at the questions that combine with you, so it's okay, I hope you can

Learning physics is very process-oriented, a process of cognition, understanding, and application.

1.Cognition: Use the things or phenomena around you or even some examples narrated by the teacher to help yourself fully understand it and become interested in it.

2.Comprehension: Use understanding to memorize formulas, theorems, experiments, etc. It can be understood and memorized in clever ways such as visual thinking. For example, what is a vacuum can be understood in this way: a vacuum is really empty, there is nothing.

3.Application: One is to cope with the exam, and the other is to explain some physical phenomena around you.

So, when studying, first of all, don't be afraid, because your previous experience of not learning well may suggest something to you, which may lead to a vicious cycle for you. Try to tell yourself, "I can do it!! In fact, psychological suggestion is very useful!

However, in order to increase your confidence, it is best to do a good job of pre-study and be aware of it.

Secondly, you should follow the teacher's train of thought in class, take some notes appropriately, and write down some knowledge points that are not clearly stated in the book or even omitted and are easy to make mistakes. Take time out of class to practice more, don't prevaricate for any reason, thus giving up the best time to practice, which can only lead to tragedy in the end.

Last but not least, you must make sure to make a timely summary. For example, the paper of the last exam has been sent down, and although it has been carefully corrected, you still have to think about why it was wrong. How is the correct answer calculated?

Will it be wrong if I get it again next time? Wait a minute.

I think that through these study methods, I will definitely be able to learn physics well.

On the premise of understanding, do more questions, start with the simple ones, do more simple ones, and slowly get the middle ones, and then gradually deepen them.

Physics must first thoroughly understand the formula, the basic definition, and the key is the foundation!

To do more questions, I generally use the tactic of sea of questions.

In fact, looking at all of the above, they are all secondary, and the main thing is to devote oneself to oneself.

I'm slowly groping and asking if I don't understand.

Current i = voltage u resistance r

Since the resistance of the appliance is a fixed value.

So when u becomes twice as much, i=u r

It can be seen that the current is twice as high.

Resistance is a property of a conductor, which is only related to the material, length, cross-sectional area and temperature of the conductor, and has nothing to do with current and voltage, so the resistance is unchanged in this problem. From i=u r, we can see that when the voltage is 2u, the current i is present'=2U R=2*U R=2i, and the current is twice as high.

From i=u r u is twice the original value, and r is unchanged, then i is twice the original time.

The reaction distance of this car:

s = vt1 + m.

Seconds the distance approached by pedestrians:

s=vt=m.

When parking, the car was still one meter away from the road where the pedestrian was passing, and the car luckily failed to hit the pedestrian.

There is a problem here: when braking, the speed is reduced from 15 m s to 0 m s after 1 second, and the distance traveled is not 15 * 1 = 15 meters, but meters. Junior high school students do not yet have the ability to calculate, but high school students who have learned acceleration have the ability to calculate.

Oh, it was wrong, I was careless.

The reaction distance is also wrong, the person walked into the meter, crossed the center of the front meter, and in the meter, collided!

1) S car = V car T anti = 15

2) The time taken by the car to travel from point A to the pedestrian:

t total = t anti + t =

During this time, the distance traveled by pedestrians:

S person = V person T total =

The distance from the road to the left side of the car is: s left = 3m+

The distance from the road to the right side of the car is: s right =

It is dangerous for pedestrians to walk in between.

There is a chance that the car will hit a pedestrian.

In the second year of junior high school, I was new to physics, and most of the questions were not difficult, but I paid more attention to the format. You need to memorize the ideas and steps to solve the problem, and if necessary, when you come to the liberal arts, memorize more things (such as physical formulas, and even the density of specific substances) into your mind.

Do more questions, the results may not be satisfactory at the beginning, but gradually you will feel it.

Pay more attention to the phenomena around you