考点18 动量守恒定律及其一般应用
《金版教程》高考总复习首选用卷·物理(旧高考)考点18 动量守恒定律及其一般应用 题组一 基础小题1.下列情况中系统动量守恒的是( )①小车停在光滑水平面上,人在车上走动时,对人与车组成的系统 ②子弹水平射入放在光滑水平面上的木块中,对子弹与木块组成的系统 ③子弹射入紧靠墙的木块中,对子弹与木块组成的系统 ④气球下用轻绳吊一重物一起加速上升时,绳子突然断开后的一小段时间内,对气球与重物组成的系统A.只有①B.①和②C.①和③D.①③④答案 B解析 小车停在光滑水平面上,车上的人在车上走动时,对人与车组成的系统,受到的合外力为零,系统动量守恒,故①正确;子弹...
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