题目内容
如图所示, 地面上有两个完全相同的木块A、B, 在水平推力F作用下运动, 当弹簧长度稳定后, 若用μ表示木块与地面间的动摩擦因数, F弹表示弹簧弹力的大小, 则 ( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241305273651731.png)
A. μ="0时," F弹=
F
B. μ="0时," F弹=F
C. μ≠0时, F弹=
F
D. μ≠0时, F弹=F
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241305273651731.png)
A. μ="0时," F弹=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130527397346.png)
B. μ="0时," F弹=F
C. μ≠0时, F弹=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130527397346.png)
D. μ≠0时, F弹=F
AC
设弹簧弹力为
,两物块具有相同的加速度,若μ=0则
可得F弹=
F,A对,B错。μ≠0时,
可得F弹=
F,C对,D错
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130527631340.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130527989650.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130527397346.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130528052962.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824130527397346.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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