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在高中物理课本上册第14页,有这样一道题:放在水平桌面上的书,对桌面的压力等于它受的重力,能不能说书对桌面的压力就是它受的重力?为什么? 首先,我让学生们各自独立地冷静地思考三分钟后,然后让学生自己先解答,最后共同分析确定是谁回答得正确。具体教法如下: 我先反问学生:“书对桌面的压力为什么会等于书的重力呢?学生们在紧张地思考着。这时不要急于让学生立即回答这个问题,而是叫每个学生拿两三本厚书叠放在伸平的手掌上不动,这样大家都感觉到了物体
In high school physics textbook book page 14, there is such a problem: the book placed on a horizontal desktop, the pressure on the desktop is equal to the gravity it receives, can you say that the pressure on the desktop is the gravity it receives? Why? First of all, I Ask students to think calmly and independently for three minutes, then ask the students to answer the questions first and finally analyze them to determine who answered correctly. The specific teaching method is as follows: I first ask the students: “Why does the pressure on the desktop equal to the gravity of the book? The students are thinking nervously. Do not rush to ask students to answer this question immediately. Instead, ask each student to take it. Two or three thick books are stacked on flattened palms so that everyone feels the object