题目内容
如图,长
,高h=1.25m,质量M=30kg的小车在水平路面上行驶,车与路面的动摩擦因数
,当速度
时,把一质量为m=20kg的铁块轻轻地放在车的前端(铁块视为质点),铁块与车上板间动摩擦因数
,问:铁块着地时距车的尾端多远?
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241150581761985.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058082407.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058129328.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058145453.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058160440.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241150581761985.jpg)
(1)0.6m/s (2)0.0875米
(1)对铁块开始做匀加速动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058192829.gif)
对小车做匀减速动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241150582071027.gif)
当铁块落块时,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058223459.gif)
t=2s
滑落时![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058254820.gif)
………………(4分)
(2)滑落后,铁块做平抛运动,小车向前做减速运动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058301652.gif)
=0.0875米………………(4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058192829.gif)
对小车做匀减速动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241150582071027.gif)
当铁块落块时,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058223459.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058238739.gif)
滑落时
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058254820.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058270636.gif)
(2)滑落后,铁块做平抛运动,小车向前做减速运动
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058285620.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115058301652.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241150583161180.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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