题目内容
一物体重为50N,与水平桌面间的动摩擦因数为0.2,现如图所示加上水平力F1和F2,若F2=15N时物体做匀加速直线运动,则F1的值可能是(g=10m/s2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241442447552827.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241442447552827.jpg)
A.3 N | B.6N | C.25N | D.30N |
AD
滑动摩擦力
,当
时,摩擦力的方向水平向左,合力等于零,物体做匀速直线运动。当
等于3N、30N时,合力均不为零且为恒力,物体均做匀加速直线运动,所以AD正确
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144244771923.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144244833602.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824144244896334.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目
题目内容
A.3 N | B.6N | C.25N | D.30N |