题目内容
如图所示,质量为m的木箱在水平恒力F推动下,从粗糙斜面的底部A处由静止开始运动至斜面上的B处,获得速度为v,AB之间的水平距离为x、高度差为h,重力加速度为g。则在水平恒力F推动木箱从A到B的过程中,下列说法正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052552902533.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052552902533.jpg)
A.木箱克服重力做的功是![]() |
B.合外力对木箱做的功是![]() |
C.推力对木箱做的功是![]() |
D.斜面对木箱做的功是![]() |
AD
试题分析:木箱过程中上升的高度为h,故重力做功为
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005255399511.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005255414498.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052554921032.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825005255508367.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052555241170.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052555391126.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250052555701144.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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