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《万有引力与航天》虽然是圆周运动的延伸,但由于学生缺乏直接的感性认知,抑或更有一种“只缘身在此山中”的境界.因此,学生对学习这部分内容显示出了困惑.“万有引力定律及其应用”这一考点对学生的要求比较高,不但要理解其确切含义及与其他知识的联系,能够进行叙述和解释,还要能在实际问题的分析、综合、推理和判断等过程中应用.为了让学生能更好地理解、掌握这部分知识,更有效地激发学生兴趣,彰显其学习原动力,笔者深感简化模型、建构情境的重要性.
Although gravitation and space flight are extensions of circular motion, students have no direct perceptual cognition or even a realm of being only in this mountain. Therefore, students have shown that this part of the study Confusion. “The law of gravitation and its application ” This test requires a high degree of students, not only to understand its exact meaning and the connection with other knowledge, to narrate and explain, but also in the analysis of actual problems, comprehensive , Reasoning and judging etc. In order to make students understand and master this part of knowledge more effectively to stimulate students’ interest and demonstrate their driving force, I deepen the importance of simplifying the model and constructing the situation.