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高中物理尤其是运动学部分经常遇到物体的运动是非匀变速运动,直接用常规方法求解极为繁琐甚至无法进行.此时若能发散思维,独辟蹊径,采用特殊的思维方法分析,顿觉柳暗花明.教学中有意识进行此类题的训练有助于拓展学生的思维空间.本文通过巧用“面积”速解棘手问题,以求予读者点滴启发.例1 两支完全相同的光滑的直角弯管 Obc 和Ob′c′,按图1所示位置放置,现将两个质量完全相同的小球分别沿两管由静止滑下(设在直角转弯处均无能量损失).两球到达出口 c 和 c′处的时间分别为 t 和
In high school physics, especially in kinematics, the movement of objects is often a non-uniform variable speed motion. It is extremely cumbersome and even impossible to directly use conventional methods to solve the problem. If we can diverge our thinking and use our own way of thinking, we can use special thinking methods to analyze and find out. The conscious training of such questions helps expand the student’s thinking space. This article uses clever use of “area” to quickly solve tricky questions to give the reader inspiration. Example 1 Two identical smooth oblong tubes Obc and Ob’c’ is placed in the position shown in Figure 1. Two balls with the same mass are now slid down from the two pipes (no energy loss at right angles). The two balls reach the exits c and c. The time at ’ is respectively t and