题目内容
(5分)质量为5kg的物体静止置于水平地面上,现对物体施以水平方向的恒定拉力,将拉力撤去,物体运动的v—t图象如图所示,试求:(1)物体所通过的位移;(2) 物体受到的滑动摩擦力;(3)0~3s滑动摩擦力对物体所做的功;(4)水平拉力对物体所做的功;(5)拉力在1s末的功率.
(1)
(2)
(3)
(4)
(5)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002186566.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142001937406.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142001984461.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002030456.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002077440.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002186566.png)
(1)
(1分)
(2)
(1分 )
(3)
(1分 )
(4)
(1分 )
(5)
1分)
本题考查的是力和运动的综合性问题。既有匀变速直线运动的规律,又结合牛顿丁二定律,和功率的计算。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002218868.png)
(2)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002296765.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002358875.png)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241420024521332.png)
(4)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002545765.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824142002623833.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241420027011009.png)
(5)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241420027641051.png)
本题考查的是力和运动的综合性问题。既有匀变速直线运动的规律,又结合牛顿丁二定律,和功率的计算。
![](http://thumb2018.1010pic.com/images/loading.gif)
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