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摩擦力的知识是初中力学的一个难点,它不仅可以考查学生对基础知识的掌握程度,同时也可考查学生应用基础知识解决实际问题的能力.在中考中,摩擦力的知识考查频繁出现,很值得关注.下面就摩擦力知识的考查来看一条好的中考题.题目:如图1、2、3、4所示是小明“探究影响滑动摩擦力大小的因素”的实验.铜块和木块的大小和形状完全相同.在实验前,小明提出了以下几种猜想:
Friction knowledge is a difficulty in junior high school mechanics, it can not only examine the students mastery of basic knowledge, but also can examine students’ abilities of applying basic knowledge to solve practical problems.In the middle school examinations, knowledge of friction frequently appears, very The following is a good examination of friction knowledge to look at a good test questions: as shown in Figure 1, 2, 3 and 4 is the small Ming “to explore the factors that affect the size of sliding friction” experiment. And the same size and shape of the wood before the experiment, Xiao Ming made the following conjecture: