Many people think that the two-level differentiation of the second year of junior high school stems from mathematics and physics, and they spend a lot of time in physics subjects during the summer vacation, but the real difficulty of the second year of junior high school is mathematics and English.
1. The phenomenon of sound, light and heat, the principle of natural knowledge is popularized.
This part of the knowledge can be understood even if the second grade of primary school students explain, and the exam can also get a high score, for junior high school students who have learned the collective proof, it is not difficult, the high score is universal, the time to do the question is abundant, and it is almost back to the grand occasion of the lower grades of primary school.
2. Force and motion. The focus of high school is not the core test center of junior high school.
The reason why physics is difficult in high school today is that the difficulty of this section in junior high school has been weakened, and without the foundation established by the average speed motion and complex force analysis, it has become difficult to mechanics in high school, which is not particularly difficult.
3. Quality and density.
There are few important test points in the force degree, which also involve more basic calculations, but only the knowledge and difficulty of this part, students with good mathematical thinking in the third and fourth grades of primary school have no pressure to learn this section.
4. Buoyancy and pressure, lever and pulley.
This is a difficult part of junior high school mechanics, which can cause a lot of problems, and it examines the real scientific thinking, which also makes many students' physics scores decline in the second semester of junior high school, but this decline is temporary, because the focus of the third junior high school is mechanics, and in the final high school entrance examination, this part is not only not high, but also focuses on basic concepts or simple calculations, and almost does not involve Jiaonan's scientific thinking reasoning and calculation.
5. Electricity. Junior high school physics is one of the few sections with improved test questions, and it is also a rare point deduction for most middle and upper middle school students, and the weight of junior high school electricity is much higher than that of mechanics, but high school is mechanics as the core.