题目内容
如图7,质量
的小车停放在光滑水平面上,在小车右端施加一水平恒力F=8N。当小车向右运动速度达到3m/s时,在小车的右端轻放一质量m=2kg的小物块,物
块与小车间的动摩擦因数
,假定小车足够长,问:小物块从放在车上开始经过
所通过的位移是多少?(g取
)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241142057315600.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205669452.gif)
块与小车间的动摩擦因数
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205685287.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205700407.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205716409.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241142057315600.gif)
8.4m
物块在前2s内做加速度为
的匀加速运动,后1s同小车一起做加速度为
的匀加速运动。
以系统为研究对象:
根据牛顿运动定律,由
得:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205809727.gif)
物块位移![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205825271.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241142058411220.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205763206.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205778208.gif)
以系统为研究对象:
根据牛顿运动定律,由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205794546.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205809727.gif)
物块位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824114205825271.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241142058411220.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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