题目内容
两物体M、m 用跨过光滑定滑轮的轻绳相连,如图放置,OA、OB与水平面的夹角分别为30°、60°,物体M的重力大小为20N,M、m均处于静止状态。则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234541443952.png)
A.绳OA对M的拉力大小为10
N
B.绳OB对M的拉力大小为10N
C.m受到水平面的静摩擦力大小为10
N
D.m受到水平面的静摩擦力的方向水平向左
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234541443952.png)
A.绳OA对M的拉力大小为10
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123454191337.png)
B.绳OB对M的拉力大小为10N
C.m受到水平面的静摩擦力大小为10
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123454191337.png)
D.m受到水平面的静摩擦力的方向水平向左
D
本题考查物体的平衡。M对O点的拉力大小为
,OB上拉力
,B错;OA上拉力
,A错;对m,
,
,方向水平向左,C错D对;选D。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123454237575.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241234542691017.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123454300908.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123454315580.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824123454362794.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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