题目内容
质量为0.3kg的物体在水平面上运动,图中的两条直线分别表示物体受水平拉力作用和不受水平拉力作用时的v-t图象,则下列说法中正确的是
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006000625814.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250006000625814.png)
A.物体不受水平拉力时的速度图像一定是b |
B.物体受水平拉力时的速度图像可能是b |
C.物体受到的摩擦力大小一定等于0.2N |
D.水平拉力的大小一定等于0.1N |
BD
试题分析:物体不受水平拉力时,水平方向只有摩擦力
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600077459.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600093788.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600109577.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600140755.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600155744.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600171554.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600187827.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600202528.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600374792.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600389714.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825000600171554.png)
![](http://thumb2018.1010pic.com/images/loading.gif)
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