题目内容
如图所示,一质量m=2kg的物块置于水平地面上。当用与水平方向成530角的力F拉物块时,物块做匀速直线运动;当改用与水平方向成370角相同大小的力F推物块时,物块仍做匀速直线运动。力F=_________N;物块与地面之间的动摩擦因数m=_________。![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302202124242.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302202124242.png)
4N;1/7(0.143)
力F与水平方向成530角时:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302202591060.png)
力F与水平方向成370角时:![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302203051088.png)
联立解得,F=4N,m=0.143
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302202591060.png)
力F与水平方向成370角时:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241302203051088.png)
联立解得,F=4N,m=0.143
![](http://thumb2018.1010pic.com/images/loading.gif)
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