题目内容
(10分)如图甲所示,有一足够长的粗糙斜面,倾角
,一滑块以初速度v0="16" m/s从底端A点滑上斜面,滑至B点后又返回到A点.滑块运动的图象如图乙所示,求:(已知:
,重力加速度g="10" m/s2)
(1)AB之间的距离.
(2)滑块再次回到A点时的速度.
(3)滑块在整个运动过程中所用的时间.
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439080573.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434390951304.jpg)
(1)AB之间的距离.
(2)滑块再次回到A点时的速度.
(3)滑块在整个运动过程中所用的时间.
(1) 16m(2)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434391111026.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439189803.png)
(1) 由图知![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439298169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439360854.png)
(2分)
(2) 滑块由A到B
(1分)
(1) (1分)
由 B到A
(2) (1分)
由以上各式得
(2分)
(3) A到B
(1分) B到A
(1分)
(2分)
本题考查匀变速直线运动和牛顿第二定律的应用,由匀变速直线运动规律可求得加速度,再由受力分析和牛顿第二定律可求得加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439298169.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439360854.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439298169.png)
(2) 滑块由A到B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434395161025.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439563894.png)
由 B到A
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439610899.png)
由以上各式得
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439875694.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241434391111026.png)
(3) A到B
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143440016460.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143440094832.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824143439189803.png)
本题考查匀变速直线运动和牛顿第二定律的应用,由匀变速直线运动规律可求得加速度,再由受力分析和牛顿第二定律可求得加速度
![](http://thumb2018.1010pic.com/images/loading.gif)
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