题目内容
如图所示,质量为m2的小球B静止在光滑的水平面上,质量为m1的小球A以速度v0靠近B,并与B发生碰撞,碰撞前后两个小球的速度始终在同一条直线上。A、B两球的半径相等,且碰撞过程没有机械能损失。当m1、v0一定时,若m2越大,则( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017034372482.jpg)
A.碰撞后A的速度越小
B.碰撞后A的速度越大
C.碰撞过程中B受到的冲量越小
D.碰撞过程中A受到的冲量越大
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017034372482.jpg)
A.碰撞后A的速度越小
B.碰撞后A的速度越大
C.碰撞过程中B受到的冲量越小
D.碰撞过程中A受到的冲量越大
D
试题分析:碰撞过程中,动量守恒,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703453695.png)
又因碰撞过程中机械能守恒,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017034691019.png)
两式联立得,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703469908.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703500797.png)
当
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703515479.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703531386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703547298.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703562494.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703531386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703547298.png)
碰撞过程中,A受到的冲量
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250017036251515.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703531386.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001703531386.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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