054动量守恒之弹簧——物块连接模型 精讲精练-2022届高三物理一轮复习疑难突破微专题
054动量守恒之弹簧——物块连接模型一.必备知识精讲模型图示模型特点(1)两个或两个以上的物体与弹簧相互作用的过程中,若系统所受外力的矢量和为零,则系统动量守恒(2)在能量方面,由于弹簧形变会使弹性势能发生变化,系统的总动能将发生变化;若系统所受的外力和除弹簧弹力以外的内力不做功,系统机械能守恒(3)弹簧处于最长(最短)状态时两物体速度相等,弹性势能最大,系统动能通常最小(完全非弹性碰撞拓展模型)(4)弹簧恢复原长时,弹性势能为零,系统动能最大(完全弹性碰撞拓展模型,相当于碰撞结束时)二.典型例题精讲:题型一:两物体一弹簧例1:A、B两小球静止在光滑水平面上,用水平轻弹簧相连接,A、B两球的质...
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