笔者有幸参加了2012年全国新课标卷的高考阅卷,现就其中第24题的答卷情况,谈一下这道题在高考中出现的若干错解、错解产生原因以及解题策略.题目拖把是由拖杆和拖把头构成的擦地工具(如图).设拖把头的质量为m,拖杆质量可以忽略;拖把头与地板之间的动摩擦因数为常数μ, I was fortunate enough to participate in the 2012 National New Curriculum exam papers, is now on the 24 questions answer the situation, talk about this question in the college entrance examination appeared in a number of misunderstandings, misunderstanding causes and problem solving strategies. Mop head is the quality of m, tow bar quality can be ignored; Mop head and floor friction coefficient between the constant μ,