题目内容
质量为m的物体放在倾角为300的斜面上,在平行斜面向下的力F作用下处于静止状态,如图,下列关于斜面对物体摩擦力大小的说法,正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016566201893.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016566201893.png)
A.一定大于F | B.一定等于F+![]() |
C.可能等于mg | D.可能等于2mg |
ACD
试题分析:物体受重力、支持力、推力F和静摩擦力处于平衡,根据共点力平衡求出静摩擦力的大小.物体受重力、支持力、推力和静摩擦力处于平衡,根据共点力平衡得,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250016566511162.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001656667646.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001656683671.png)
故选ACD
![](http://thumb2018.1010pic.com/images/loading.gif)
练习册系列答案
相关题目