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今年第12届全国初中物理知识竞赛初赛试题(初三组)的第六大题,是一道运动竞赛题.此题的内容实质曾见于往届物理竞赛的填空和选择题中;这次却以计算大题的形式出现,明确要求运算证明的具体过程,足见编题者重点考查参赛者的数理知识综合能力和逻辑运算推理能力的意图.正因为如此,此题成为这次竞赛中失分率和区分度都较高的一道好题.初步分析:解析此题计有两条分析思路、至少有六种
The sixth topic of the 12th National Junior Physics Physics Knowledge Contest preliminary examination (3rd grade group) this year is a sports contest title. The content of this topic has been found in the blanks and multiple-choice questions of previous physics contests; this time it is calculated The appearance of the big question clearly requires the concrete process of the proof of operation. It is clear that the editors mainly examine the competitor’s comprehensive ability of mathematical knowledge and the intention of reasoning ability of logic operation. Because of this, this question becomes the proportion of the points in this contest. A good problem with a high degree of distinction. Preliminary analysis: There are two analytical ideas for analyzing this problem, at least six