Compared with our time, science in junior high school is becoming less and less like science, and many sections that test science thinking have been weakened, and the concentration of difficulties makes it difficult for students who do not rely on external forces to learn independently and not rely on external forces.
In physics and chemistry, the competition for memory rather than scientific thinking, even if the calculation is involved, there is very little, but the real deduction points focus on the elaboration of experimental phenomena, and compete for the standardization of the big topic statement, and the children in the city and more trained children have more advantages in this type of question.
In the past, physics started from motion, and then sound phenomena, and the focus of acoustic phenomena was not a basic concept, but the use of sound propagation speed, specific scene analysis and calculation, which can well reflect the gap in students' scientific thinking
After that, the quality and density, buoyancy pressure, and lever pulley are all focused, and the whole mechanical system has a very obvious connection between junior high school and high school.
In junior high school physics, after the dilution of mechanics, the proportion of basic concepts of photoacoustic heat has increased, and the overall difficulty is low, so even if middle school students do not invest too much time, it is easy to get high scores.
Students who previously excelled in physics in middle school tended to excel in high school, but now there is little significant correlation.
The same is true of chemistry, downplaying the calculation and derivation of chemical reactions, focusing on the memory and examination of experimental phenomena, especially some essay questions, compared to who said the standard answer word for word, many students with good scientific thinking will be wrong in organizing language in the understanding situation, and good scientific thinking not only has no advantage, but is at a disadvantage because of the lack of hard memorization.
Mathematics is more difficult on the surface, but this difficulty is often too concentrated, in the past, the factorization of the second stage of junior high school is the key and difficult, and the congruent triangle is comparable, but now it is often only in the subject of mathematics, a few questions in the limited knowledge section reflect the difficulty, but this difficulty is often too large, so that ordinary eugenics can not do it, so that students with weak scientific thinking can still become eugenics in junior high school.