题目内容
如图甲所示为一风力实验示意图。开始时,质量m=2kg的小球穿在固定的足够长的水平细杆上,并静止于O点。现用沿杆水平向右的恒定风力F作用于小球上,经时间t=1s后撤去风力。小球沿细杆运动的v-t图像如图乙所示(g取10 m/s2)。试求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018227011037.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018227172814.png)
(1)小球沿细杆滑行的距离;
(2)小球与细杆之间的动摩擦因数;
(3)风力F的大小。
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018227011037.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250018227172814.png)
(1)小球沿细杆滑行的距离;
(2)小球与细杆之间的动摩擦因数;
(3)风力F的大小。
(1)3m(2)0.1(3)6N
试题分析:(1)由图像可得
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822732328.png)
故小球沿细杆滑行的距离
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822748515.png)
(2)减速阶段的加速度大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822763694.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822779647.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822795445.png)
(3)加速阶段的加速度大小
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822810706.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822826708.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001822841424.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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