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斜面机械效率的探究作为探究题是近几年中考考查的热点,它有效地综合了功、机械效率等相关知识,能培养学生分析与解决问题的能力.下面就斜面的机械效率究竟与什么因素有关?在这样的实验探究中需要注意什么问题?例(2011年湛江)在湛江港码头,小华看到工人利用斜面把货物推到车上.联想到上物理课时老师讲过的知识,小华想探究斜面的机械效率可能与哪些因素有关?小华提出了以下的猜想:
As a research topic, the research on the mechanical efficiency of bevel is a hot spot in the mid-term examinations in recent years. It effectively integrates the related knowledge of work and mechanical efficiency and can train students’ abilities of analyzing and solving problems. Related? In this experiment to explore the need to pay attention to what the problem? (Zhanjiang in 2011) in Zhanjiang Port Terminal, Xiaohua workers to see the use of beveling to push the goods into the car .Remember the knowledge of the teacher talked about physics, small China would like to explore the slope of the mechanical efficiency may be related to what factors? Xiao Hua made the following conjecture: