题目内容
下列四组共点力分别作用于同一物体上,其中不可能使物体作匀速直线运动的是 ( )
A.1N, 4N, 6N | B.2N, 4N, 6N | C.3N, 4N, 6N | D.4N ,4N, 6N |
A
试题分析:合力与分力的大小关系为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152415393735.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824152415456628.png)
点评:难度较小,当第三个力处于其余两力之和和两力之差时三个力的合力为零
![](http://thumb2018.1010pic.com/images/loading.gif)
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题目内容
A.1N, 4N, 6N | B.2N, 4N, 6N | C.3N, 4N, 6N | D.4N ,4N, 6N |