物理学是研究自然界中各种物理现象的规律和物质结构的一门科学。如何根据初中学生的认知特点,精心设计演示实验,提高演示实验的直观性,同时,对学生实验起到示范性作用。1.实验前应做好充分准备。如在初四《电阻》一节中,在做金属的电阻随金属的温度升高而增大的实验时,如果没 Physics is a science that studies the laws and material structures of various physical phenomena in nature. How to design experiments according to the cognitive characteristics of junior high school students to improve the visualization of demonstration experiments, at the same time, to play an exemplary role in student experiments. 1. Before the experiment should be fully prepared. As in the first four “resistance” section, in the metal resistance increases with the metal temperature increases the experiment, if not