题目内容
如图甲所示,两物体
、
叠放在光滑水平面上,对
施加一水平力
,
关系图象如图乙所示。两物体在力
作用下由静止开始运动,且始终保持相对静止,则
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164903810926.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241649040442601.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164902375300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164902656309.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164902375300.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164903108302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164903358381.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164903108302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164903810926.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241649040442601.png)
A.第1![]() |
B.第2![]() ![]() ![]() |
C.第2![]() |
D.物体![]() ![]() ![]() |
BD
试题分析:根据牛顿第二定律研究加速度与时间的关系,分析物体运动的性质.根据牛顿第二定律,分别对AB整体和B研究,分析.
A、根据牛顿第二定律得知,两物体的加速度
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164906259629.png)
B、由图看出,1s-2s时间内,F的方向不变,物体一直加速,第2
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164904450240.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164903108302.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164902375300.png)
C、由于惯性,第2
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164904450240.png)
D、由
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824164907819774.png)
故选BD。
点评:本题是牛顿第二定律的应用问题,采用整体法和隔离法相结合研究.要注意F的正负表示F的方向.
![](http://thumb2018.1010pic.com/images/loading.gif)
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