题目内容
如图所示,物体在水平力F
=15N、F
=6N的作用下,静止在水平面上,若F
保持不变,当F
减小至10N时,物体受到的摩擦力( )
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160129052875.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160128631196.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160128740239.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160128740239.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160128631196.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160129052875.png)
A.增大至10N | B.变为9N |
C.减小至6N | D.减小至4N |
D
试题分析:由题,物体原来在水平力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160129270782.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160129520546.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160129614389.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160129738779.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824160129848723.png)
故选D
点评:可以看出,只要物体保持静止,静摩擦力与两拉力的合力大小相等,方向相反,随着这个合力变化而变化.
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.增大至10N | B.变为9N |
C.减小至6N | D.减小至4N |