题目内容
如图所示,水平传送带长为s,以速度v始终保持匀速运动,质量为m的货物无初速放到A点,货物运动到B点时恰达到速度v,货物与皮带间的动摩擦因数为μ,当货物从A点运动到B点的过程中,以下说法正确的是( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250031326553197.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250031326553197.jpg)
A.摩擦力对物体做功为![]() |
B.摩擦力对物体做功为μmgs |
C.传送带克服摩擦力做功为μmgs |
D.因摩擦而生的热能为2μmgs |
AB
试题分析:货物在传送带上做匀加速直线运动,到达B点时速度为v,货物则由动能定理可知,摩擦力对货物所做的功为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003132671338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003132702545.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825003132718540.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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