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高考力学综合题通常涉及动量、能量问题,且该类问题往往解法不唯一,这就对命题的严谨性提出了一定的要求,需综合考虑各种方法,使它们结果一致.由于各种方法的难易不同,使得命题者可以用同一个模型自由控制试题的难度.图1这是2008年全国高考理综Ⅰ卷的一道动量计算题,题目如下.图1中滑块和小球的质量均为m,滑块可在水平放置的光滑固定导轨上自由滑动,小球于滑块上的悬点为O,由一不可伸长的轻绳相
College entrance mechanics comprehensive questions usually involve momentum and energy problems, and such problems are often not the only solution, which sets the rigor of the proposition of the certain requirements, we must take into account the various methods to make them the same result. Due to various methods Difficult to be different, so that the proponent can use the same model of the freedom to control the difficulty of the test.Figure 1 This is the National College Entrance Examination in 2008 Volume Ⅰ a momentum calculation, the title is as follows: Figure 1, the mass of the slider and the ball are For m, the slider can slide horizontally on a smooth fixed rail, the ball on the slider hanging point O, by a non-elongated light rope phase