How to learn science well in primary school? What science teaches in elementary school

First of all, attitude comes first.

The amount of knowledge in elementary school is not large, and the difficulty is not particularly high. Generally, as long as you have a good attitude, you can master it better. In the public's perception, science belongs to the "sub-subject" and is not among the three main courses except language.

Students generally do not attach as much importance to it as to the number of foreign languages that have been tested for a long time. There will even be casual speech in class and bullying the deputy subject teacher.

Secondly, interest is the first motivation for learning.

Once there is a strong interest in a certain subject, parents do not need to pay much attention, and children will use their time after class to study independently. Children will want to get to the bottom of science-related phenomena in their lives, consult information, and connect with teachers and classmates. even pestered his parents and asked them to be "annoying".

Finally, the emphasis is placed on the place of experimentation in the scientific discipline.

Scientific knowledge cannot be memorized. In particular, with the continuous development of cutting-edge technology, the knowledge that appears in textbooks needs to be constantly updated. There is also a close relationship between primary school science and the subjects of physics, chemistry and biology that will be studied in junior high school.

If you start with the stereotype that science is a subject that you only need to memorize and memorize.

It is easy to move to other subjects in junior high school in the future.

Experimental results in science need to be obtained through careful and accurate experiments. If possible, the family can also open up a small world for the child, equipped with an experimental toolbox, so that the child can tinker with his own inventions.

Heart, perseverance and unremitting efforts. If every student has these three good attitudes, they will definitely be able to learn science well. Learn some specific practices of science well.

1.Make it a habit to prepare. It's a good idea to preview what you're going to learn that day the day before.

Ways to learn math in elementary school:

1. Do a good job of pre-class preparation and grasp the initiative to listen to the class. The quality of preparation before class directly affects the effect of listening to the class.

2. Listen attentively and take good notes in class.

3. Review in time and transform knowledge into skills.

4. Complete homework conscientiously, form skills and skills, and improve the ability to analyze and solve problems.

5. Summarize in a timely manner and organize and systematize the knowledge learned.

Primary school students are more active, mainly to calm the children's minds. I found the subject interesting and was interested in learning it. I also listen carefully in class.

In elementary school science, it is important to read and memorize some things, and there are very few new things to understand, as long as the child can memorize them.

Look at picture books, extracurricular books, books about natural science, cosmic science, etc.

Discharge cooling is another type of convection cooling. Unlike regenerative cooling, the coolant used for exhaust cooling absorbs heat to the thrust chamber and is discharged out of the combustion chamber instead of entering the combustion chamber to participate in combustion. Direct drain coolant reduces the thrust chamber specific impulse, so the coolant flow for drain cooling needs to be minimized while only using drain cooling at the outlet section of the nozzle that is relatively less heated.

There is also radiative cooling, in which the heat flow is transferred from the combustion products to the thrust chamber, and then the heat is radiated by the thrust chamber wall to the surrounding space. Radiative cooling is characterized by simplicity and small structural mass. It is mainly used in the extension section of large nozzles and the thrust chamber of small thrust engines using high-temperature resistant materials.

When cooling in the thrust chamber of the tissue, a relatively low temperature liquid or gas protective layer is established on the surface of the thrust chamber wall to reduce the heat flow to the thrust chamber wall, reduce the wall temperature, and achieve cooling. Internal cooling is mainly divided into three methods: internal cooling (shield cooling), membrane cooling and diaphoretic cooling of head tissues. After the internal cooling measures are adopted in the thrust chamber, the mixing ratio near the wall of the combustion chamber is different from the optimal mixing ratio in the central area (in most cases, the near-wall layer rich in fuel is used) due to the need to reduce the temperature of the protective layer, resulting in the uneven distribution of the mixing ratio along the cross-section of the combustion chamber, so that the combustion efficiency is reduced to a certain extent.

Membrane cooling is similar to shield cooling in that it cools the thrust chamber wall by establishing a uniform and stable coolant film or air film protective layer near the inner wall surface, except that the coolant used to establish the protective layer is not injected by the injector, but is supplied through a special cooling belt. The cooling band is generally arranged in a cross-section of the combustion chamber or the convergence section of the nozzle. There can be several cooling bands along the length of the combustion chamber.

In order to improve the stability of the membrane, the coolant often flows through the gaps or small holes in the cooling belts, and when sweating is used, the thrust chamber wall or part of the inner wall is made of porous material with a pore diameter of tens of microns. Porous materials are usually sintered with metal powders or pressed with metal mesh. In this case, the number of pores per unit area is increased by making the micropores in the material as evenly distributed as possible.

The liquid coolant penetrates into the inner wall, creating a protective film that reduces the density of the heat transferred to the wall. When the flow rate of liquid coolant used for sweat cooling is above a certain threshold, a liquid film is formed near the wall of the thrust chamber. When the coolant flow rate is below the critical flow, the inner wall temperature will be higher than the coolant boiling point at the current pressure, and some or all of the coolant will evaporate, forming an air film.

In addition to the above thermal protection, there are other thermal protection methods such as: ablation cooling, thermal insulation cooling, hot melt cooling and composite protection of chamber walls. 3. Thermal protection scheme of high enthalpy gas generator Based on the above methods and the actual situation, the thermal protection method of high enthalpy gas generator is obtained.

The combustion chamber of a high-enthalpy gas generator differs from that of a liquid rocket engine, eliminating the front thrust chamber part, making its structure simpler and more effective. Then, the thermal protection involved is the thermal protection part of the combustion chamber wall. As the fuel enters the combustion chamber, it quickly decomposes and releases large quantities.

Primary science teaches physical science, life sciences, earth and space sciences, and technology and engineering.

Primary Science (Grades 3-6)" describes: from the perspective of theoretical research, this project is based on a large number of domestic and foreign literature research, questionnaire surveys and on-site observations, the concept and types of learning, the definition and types of learning, and the basic principles of promoting learning in subject teaching

A more systematic theoretical viewpoint was put forward in the evaluation of learning, and it was synthesized into a "three-dimensional theory of learning". The core idea of this theory is: to oppose rigid and narrow understanding and learning, to advocate the analysis of activities from the three perspectives of object, purpose and method, and to advocate the diversification of learning forms.

From the perspective of applied research, under the new curriculum structure system, the project has initially established a teaching and research team of the main disciplines of primary school, junior high school and high school, and carried out preliminary research on the implementation and evaluation points of learning in various disciplines from the aspects of object and content, purpose, method and form, etc., and carried out the first learning and teaching experiment more systematically, and accumulated a large number of learning teaching examples and teaching design schemes.

From a practical point of view, the experimental schools of this project are actively exploring the methods and measures to establish a school support system for learning from the aspects of teacher training, curriculum resource development and utilization, teaching and scientific research, teaching evaluation, etc., so as to provide effective support for teachers and students to carry out learning and teaching experiments. This work needs to be further advanced.

This series of books is one of a series of research results of this project, which brings together the best examples of learning and teaching in the main subjects of primary, middle, and high school in the new curriculum structure. Different from the traditional teaching examples in China, the teaching examples organized in this series are not written in the form of teaching records of teacher-student dialogues, but in the form of documentary teaching narratives.

In this kind of documentary teaching narrative, the teacher uses the first person or the third person to describe the design ideas, implementation process, effects and experiences of himself or others in a teaching example.