题目内容
如图所示,小车沿水平面做直线运动,小车内光滑底面上有一物块被压缩的弹簧压向左壁,小车向右加速运动。若小车的向右加速度增大,则车左壁受物块的压力F1和车右壁受弹簧的压力F2的大小变化是:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003203963913.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250003203963913.jpg)
A.F1不变,F2变大 |
B.F1变大,F2不变 |
C.F1、F2都变大 |
D.F1变大,F2减小 |
B
试题分析:物块与小车具有共同加速度,而物块在水平方向的合力就是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000320552441.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000320583353.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000320598630.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000320614333.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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