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运动的合成与分解是研究曲线运动的基本方法。在教学斜抛运动时,一般总是分别讲述竖直与水平两个方向上分运动的情况。为使学生获得一个完整清晰的运动图象,不妨在黑板上画出一条斜抛
The synthesis and decomposition of motion is the basic method for studying the motion of curves. When teaching slanting movements, it is generally always the case that the vertical and horizontal movements are divided in two directions. To allow students to obtain a complete and clear motion picture, draw a diagonal cast on the blackboard