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长春市某教师在公开课“正午太阳高度的变化”中以先前布置给学生的一则地理观测实验来导入新课。该实验要求3个小组的学生自9月12日至9月18日期间,每天在北京时间12:20观测当地杆影的长度,并记录和分析。一、观测实验实验材料:木棍、卷尺、纸笔等。实验步骤:第一步,准备材料,学生分组;第二步,3个小组分别测量北京时间12:20的杆影长度;第三步,根据3个小组所测杆影长度计算平均值;第四步,记录并分析观测数据。数据记录:
A teacher in Changchun introduced a new lesson in a public lesson “Changes in Solar Altitude at Midday ” in a geophysical experiment previously arranged for students. The experiment required students from three groups to observe the length of local shadows every day from September 12 to September 18 at Beijing time 12:20 and record and analyze them. First, the experimental observation experimental materials: sticks, tape measure, pen and paper. The second step, three groups were measured at 12:20 Beijing time lever shadow length; the third step, based on the three groups measured rod length calculated average; the first Four steps to record and analyze the observations. data record: