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等效法是在效果相同的前提下,对复杂的物理问题,进行变换,达到化繁为简、化难为易的目的. 例1 沿水平方向向一堵竖直的光滑墙壁抛出一弹性小球,抛出点O离水平面的高度是h,距墙壁的水平距离为S.小球与墙发生弹性碰撞后,落在水平地面上,落地点距墙壁的水平距离为2S,如图1所示.求小球从抛出到落地所需的时间及小球抛出时的速度. 析若把全过程分为O至A的平抛运动和A至B的斜下抛运动来处理,
Equivalent method is in the same effect under the premise of the complex physical problems, to transform, to simplify the complex, the difficulty of easy purposes. Example 1 along the horizontal direction to a vertical smooth wall thrown a flexible ball , The height of throwing point O from the horizontal plane is h, and the horizontal distance from the wall is S. After the ball collides with the wall elastically, it falls on the horizontal ground with a horizontal distance of 2S from the wall as shown in FIG. 1 Find the ball from throwing to landing the time required and the speed of the ball throwing.If the whole process is divided into O to A flat throwing exercise and A to B oblique throwing movement to deal with,