题目内容
两个完全相同的物块a、b质量均为m=1.2kg,在水平面上以相同的初速度从同一位置开始运动,图中的两条直线表示物体受到水平拉力F作用和不受拉力作用的v-t图象,g取10m/s2 。求:
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326327935284.png)
(1)物块a所受摩擦力的大小;
(2)物块b所受拉力F的大小;
(3) 8s末a、b间的距离。
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326327935284.png)
(1)物块a所受摩擦力的大小;
(2)物块b所受拉力F的大小;
(3) 8s末a、b间的距离。
(1)f=1.8N(2)F=2.7N(2)⊿s=s2-s1=60m
(1)由图得物块a所受的摩擦力,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326328401053.png)
(2)物块b所受拉力F的大小,![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132632886607.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326329961536.png)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326330421492.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326328401053.png)
(2)物块b所受拉力F的大小,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824132632886607.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326329961536.png)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241326330421492.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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