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我县对高中93届学生最近进行了一次统测。统测卷中有这样一个填空题:起重机在5秒钟内将2吨货物由静止开始匀加速提升10米高,此起重机应具备的最小功率是____千瓦。(取g=10米/秒~2) 检测结果,该题得分率之低令人吃惊。得出正确结论的学生屈指可数,面对这一结局,不由得使人深思:学生们究竟错在什么地方?思维的障碍在哪里? 通过对两个学校的两个重点班试卷的抽样分析,发现学生在解这个题时的思路和答案主要有以下两
My county conducted a unified survey of 93 students from high school recently. There is a blanking question in the survey roll: the crane lifts 2 tons of cargo from standstill to 10 meters in height within 5 seconds. The minimum power the crane should have is ____ kilowatts. (take g=10m/s~2) The test result is surprisingly low. There are only a handful of students who come to the correct conclusions. In the face of this outcome, one cannot help but ponder: What exactly are the students wrong and where are the barriers to thinking? Through a sample analysis of the two key classes of the two schools, The students found the following ideas and answers in solving this problem: