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高一物理“重力做功的特点”是学生比较难于理解的问题。难就难在物体作曲线运动时做功情况的分析。为突破这一难点,我们采用从具体到抽象的方法,通过对一个典型例题的讲解、运用物理实验和电教投影相结合的方法,既解决了实际问题,提高了分析能力,又总结出重力做功是特点,圆满地完成了新课教学任务。我们的做法和体会如下: 一、精心准备巧妙配制这道例题是这样的:金属块质量m=20千克,长宽各20厘米,高40厘米,要推翻它。求:(1)外力对物至少做功____;(2)重力做功____。
The physics “characteristics of gravity work” is a problem that students find difficult to understand. It is difficult to analyze the work situation when the object is doing curve motion. In order to overcome this difficulty, we adopt a method from concrete to abstract, through the combination of a typical example and a combination of physics experiments and audio-visual projections, which not only solves practical problems, but also enhances analysis capabilities, and sums up gravity. It is a feature that has successfully completed the task of teaching a new class. Our practices and experiences are as follows: 1. Well-prepared to skillfully prepare this example The question is this: The mass of the metal block is m = 20 kg, each length and width is 20 cm, and the height is 40 cm. It is necessary to overturn it. Seeking: (1) External forces do at least work on the object ____; (2) Gravity work ____.