题目内容
如图所示为一质点作直线运动的速度-时间图像,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241558146914345.jpg)
求(1)14-18s物体的加速度大小
(2)物体第3s内的位移
(3)0-22s物体的总位移
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241558146914345.jpg)
求(1)14-18s物体的加速度大小
(2)物体第3s内的位移
(3)0-22s物体的总位移
(1)1.75
,(2)2.5m(3)91.5m
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155814722489.png)
试题分析:(1)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155814816597.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155815034623.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155814722489.png)
(2)0-5s, a=
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155815315279.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155814722489.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155815690628.png)
前3s位移,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155815861300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816002338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816766331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816002338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
第3s内位移为
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816766331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155815861300.png)
(3)0-5s,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155815861300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816002338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816766331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
14-18s,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155818248331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816002338.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816173214.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155815861300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155816766331.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824155818248331.png)
点评:在分析v-t图像时,需要理解图像的斜率表示物体的加速度,图像与坐标轴围成的面积表示物体运动的位移
![](http://thumb2018.1010pic.com/images/loading.gif)
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