How to combine students' life practice with the teaching of "The Earth is Tired"

Physics is a natural subject with a long history. With the development of science and technology and the progress of society, physics has penetrated into all fields of human life. Moreover, the purpose of studying physics is to help human beings solve some practical problems. After nearly one year of teaching and learning, I think this subject is often combined with real life as much as possible in the teaching process, so as to achieve the purpose of combining physics with practice. At present, many common sense of life is involved in the examination questions of senior high school entrance examination. Students are required to observe the characteristics of some common things in life and what are the reasons for this. Therefore, it is necessary for our teachers to give more examples from life in class to explain physical knowledge and expand their knowledge, because some things are things they don't pay attention to but are commonly used in life. Therefore, we should contact real life as much as possible in teaching, so that students can intuitively see the phenomenon and abstract things in life into basic physical knowledge. So how can we contact reality in class? 1. Highlighting the practicality of knowledge Physical knowledge is rich and colorful, and it is widely used in life. Learning physics can not only learn physical knowledge, improve the ability of life, but also learn some methods to study problems, which is very useful for people to deal with other problems. Learning physics can also cultivate students' thinking ability. Physics experiment teaching can cultivate students' hands-on operation ability, so middle school students must attach importance to physics learning. Modern China is in line with the world in all aspects, and education is no exception. We should also focus on improving students' living ability in teaching. Physics is an experimental science, and we should combine physics knowledge with production and life as much as possible in teaching, which can not only improve students' interest in learning physics, It can also improve students' survival ability. In the teaching process, it is necessary to improve students' creativity and cultivate students' interest in learning, so as to achieve the expected learning effect. For example, there is a question that gives two scissors, one for cutting iron sheets and the other for haircut scissors, and it is necessary for students to pay attention to it in their daily life. Therefore, when we talk about the lever part, we can show students the levers that are common in life to let them know how these tools work. What are the advantages of designing this way, and is there any way to improve it, which will enhance students' interest in learning. Moreover, we can also use what we have learned to solve some practical problems, for example, when buying a schoolbag, try to choose a wide strap, which is more comfortable to carry. The pressure is reduced. For another example of pressure, the blind road is a convenient and safe road facility for the blind. The blind road is generally paved with two types of bricks, one is a strip guide brick to guide the blind to move forward with confidence; One kind is a cue brick with dots, which reminds the blind that there is a turning point here, so they can turn. Then these striped bricks reduce the contact area with the feet and increase the pressure, which can be felt obviously by the blind. When talking about mechanical efficiency, many students confuse it with power, work, and whether it is labor-saving. I have heard a lesson, and this teacher distinguished it from our students' usual homework, and regarded the amount of homework as the amount of work done. The speed of doing homework is regarded as power, and the correct rate of doing homework is regarded as mechanical efficiency. In this way, students can distinguish these quantities well. When solving such problems, they think of doing homework. For example, is it correct to ask in the topic that the greater the power, the higher the mechanical efficiency? Students can quickly say that they are wrong and do their homework quickly, but they may not be right, so the power is high, the mechanical efficiency is high, and the power is not necessarily high. There are many such examples, all of which are linked with practical problems to help us understand and solve problems. Physics is a highly practical science, which is closely related to industrial and agricultural production and daily life. In teaching, teachers should combine specific teaching contents with production and life reality. Highlight the practicality of knowledge, physical knowledge. Physical laws themselves are summaries and abstractions of natural phenomena. By abstracting simple tools in life, through the introduction of these knowledge, students will be more aware of the position and role of scientific knowledge in daily life, industrial and agricultural production and even high-tech fields, so as to believe in and love science more. Establish a good sense of science and technology and the idea that "science and technology are the primary productive forces". 2. Strengthen experimental teaching "Science is the science of experiments, and experiments are scientific experiments", which highlights the importance of experiments. Strengthen experimental teaching, It is helpful to cultivate students' hands-on operation ability, observation ability, ability to analyze and solve problems independently, scientific attitude of seeking truth from facts, innovative consciousness and creativity. At the same time, it also enables students to receive good education on scientific and technological awareness. (1) Pay attention to experimental teaching, and change some demonstration experiments into students' stage demonstration forms, providing students with more hands-on operation opportunities, allowing students to fill in data and find rules. For example, when talking about buoyancy, Students can do experiments with their hands. A piece of plasticine will sink when put into water. How to make it float? Students will pinch it into a boat shape, so that the goal can be achieved. Let's talk about hollowing out to increase buoyancy. Students will understand it well. The principle of the ship is the same as this. For example, when exploring the balance conditions of leverage, let students come up and write down their own data and analyze why it is balanced. What may be the balance conditions? These practices can enable students to experience the research process and stimulate their interest. (2) Pay attention to students' experimental attitude: organize students to seriously discuss the problems in the experiment, analyze the reasons, and find out the methods to solve the problems, and record the data realistically according to the actual situation of the experiment, so as to cultivate students' serious and realistic scientific attitude and the ability to analyze and solve problems independently. If the data obtained are different from the facts, Don't deny it immediately, but analyze the reasons and give a reasonable explanation. For example, when introducing the physical quantity of material density, you can cite several common objects, but don't just cite solids, you can also do experiments with water or salt water, which not only takes care of the comprehensiveness of the experiment, but also paves the way for the experiment of measuring liquid density in the next class, so that students can think about the measurement method in advance. When I am in class, I take water as an example to implement teaching, and first measure the cup quality m, The total mass of water and cups is m', then the mass of poured water is m-m', and then the water is poured into a measuring cylinder to measure the volume V, and then the density of water is obtained by using the formula. However, some students have measured the density of water as 1.1g/cm3, so we can't immediately deny the students' results. We should analyze the reasons with them. Through discussion, we all agree that the first reason may be that the instrument is not precise enough, and the second reason is that the measured volume of water is not accurate enough. Because there will be residue on the cup wall in the process of pouring, the measured V is too small, so the measured density is too large. This will make it easier for students to accept, thus increasing their sense of accomplishment and enhancing the accuracy of the experiment through their own thinking, which will make them more impressed. (3) Try to let students design their own experiments according to what they have learned and cultivate their innovative consciousness. For example, when we do the pulley block labor-saving experiment, it is theoretically F=1/nG. However, when we do experiments, the measured values are a little too large, so we should respect the experimental results and analyze the reasons. After discussion, we found that the force I use not only bears the weight of the heavy object but also the weight of the moving pulley, so the data is a little too large. So don't blindly rely on conclusions, prove it through experiments and analyze the reasons. Cultivate a scientific attitude of seeking truth from facts. 3. Pay attention to the connection between physics and other subjects. Physics is a comprehensive subject based on experiments. It originates from nature and involves people's daily life, industrial and agricultural production and various fields of science and technology. In middle school, it is also closely related to Chinese, mathematics, chemistry, history, geography and other disciplines. It belongs to science, which has both the characteristics of liberal arts and science. As far as simple learning methods are concerned, I think physics is between arts and sciences. Many students mistakenly think that learning physics is just like learning mathematics, and they can remember formulas and perform them. This is extremely wrong. To learn physics well, we should not only have a certain knowledge of Chinese and mathematics, but also have a certain basic knowledge of geography, history and other disciplines. More importantly, we should use the ability of Chinese understanding, association, divergent thinking and high generalization and induction, and also use the abstract thinking ability of mathematics. Logical reasoning ability. For example, if you explain the law of conservation of mechanical energy, you should pay attention to the following points: 1. All theorems and laws in physics are based on certain conditions. The law of conservation of mechanical energy also has conditions. 2. Explain the meaning of conservation (unchanged in change). 3. The law not only says the conditions of conservation of mechanical energy, but also explains when mechanical energy is not conserved (changed) and who decides the amount of change, except gravity and elasticity. The algebraic sum of other work done is not zero. 4. The key to the application of this law is to determine two states of a process, that is, the mechanical process experienced by the research object. We should know the stress of the research object in this process and how much work each force does to the research object, regardless of each state in the process. The two states refer to the state of the research object at the beginning and end of the process, and find out the distance between the initial state and the final state of the research object and the zero potential energy surface (point). The spring is deformed relative to the original length, and the speed of the object, etc. Through the above four-step analysis, students have truly mastered the connotation and extension of the law of conservation of mechanical energy, and have a good understanding of it. The above analysis not only shows the application of Chinese knowledge, but also the manifestation of mathematical ability. Therefore, if you want to learn physics well, you should be good at integrating with other disciplines, so as to better apply physics and help our lives. It is used in many aspects of life. In short, physics teaching and life practice are inseparable and complementary. We should combine them organically for better understanding and application.