题目内容
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241203270551575.gif)
将某种材料做成的均匀长方体锯成A、B、C三个物块然后对拼在一起,放在光滑水平面上,如图所示,A、B两物块质量都是1kG.用8N的水平力F从正面推C,使A、B、C组成的长方体保持矩形的整体沿力的作用方向平动.求:
(1)运动中C对A的作用力的大小和方向;
(2)运动中B对C的静摩擦力的大小和方向;
(3)如果从力开始作用时计时,经过3s,对A、B两物体共做了多少功?
(1)2N,方向与F相同.(2)1N,方向如图 (3)36J
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241203270711610.gif)
(1)a=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120327086999.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824120327102936.gif)
∴
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241203271181037.gif)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241203271801115.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241203271961505.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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