053动量守恒之子弹打木块模型及悬绳模型 精讲精练-2022届高三物理一轮复习疑难突破微专题
053动量守恒之子弹打木块模型及悬绳模型一.必备知识精讲1.子弹打木块模型基本特点(1)“木块”放置在光滑的水平面上①运动性质:“子弹”对地在滑动摩擦力作用下做匀减速直线运动;“木块”在滑动摩擦力作用下做匀加速直线运动.②处理方法:通常由于“子弹”和“木块”的相互作用时间极短,内力远大于外力,可认为在这一过程中动量守恒.把“子弹”和“木块”看成一个系统:a.系统水平方向动量守恒;b.系统的机械能不守恒;c.对“木块”和“子弹”分别应用动能定理.(2)“木块”固定在水平面上①运动性质:“子弹”对地在滑动摩擦力作用下做匀减速直线运动;“木块”静止不动.②处理方法:对“子弹”应用动能定理或牛顿第二定...
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