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现行初中物理教材第一册第五章“液体压强的公式”一节课中的难点是:液体的压强只跟液体的密度和深度有关,与液体的总重和体积无关。这个难点是如何形成的呢?从学生学习物理的思维规律看,形成教学难点的一个关健因素是思维定势的消极影响。因为,在学习这节课的内容之前,学生就从第一节课的图5—2(课本92页)中知道压强公式(P=F/S)中的压力与重物(砝码)的物重有直接关系,在第五节一开头又是这样叙述的“液体因
The difficulty in the first class of Chapter 5 of the current junior middle school physics textbook “Formula of liquid pressure” is that the pressure of the liquid is only related to the density and depth of the liquid, and is independent of the total weight and volume of the liquid. This difficulty is how to form it? From the perspective of students studying physics thinking, a critical factor in the formation of teaching difficulties is the negative influence of mindset. Because, before studying the content of this lesson, the students learned about the pressure and weight (weight) in the pressure formula (P=F/S) from Figure 5.2 in the first lesson (book 92). There is a direct relationship between the weight of goods, and at the beginning of the fifth quarter it is again stated