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江苏2014高考物理第15题是力学压轴题,综合考查了矢量的合成分解、牛顿运动定律、功能关系等方面,难度较大.本题难点为滑动摩擦力的方向的判断以及参考系的选取问题,在原参考答案中是以地面为参考系求解的,这样使得题目的求解更加困难,计算更加繁琐,许多同学连答案也难以看懂.很多资料上也给出了各种优化的解法,但有些还是不尽人意.下面给出以传送带乙为参考系的解法,使得问题的求解简单易懂.
Jiangsu 2014 college entrance examination physics 15 questions is the stamina of mechanics, comprehensive examination of the synthesis of the decomposition of the vector, Newton’s laws of motion, functional relationships, etc. This difficulty is the sliding friction to determine the direction and the selection of the reference system, In the original reference answer is based on the ground for the reference to solve, so that the problem solving more difficult, more complicated calculations, many students can not even understand the answer.Many data also gives a variety of optimization solutions, but some still Not satisfactory. The following gives the conveyor B as the reference system solution, making the problem easy to understand.