题目内容
(10分)如图所示,接触面均光滑,球处于静止,球的重力为G="50" N,
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015514742754.jpg)
(1) 根据球的重力的作用效果,画出重力分解示意图
(2) 求球对斜面的压力和球对竖直挡板的压力.
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015514742754.jpg)
(1) 根据球的重力的作用效果,画出重力分解示意图
(2) 求球对斜面的压力和球对竖直挡板的压力.
(1)如图所示 (2)
50N
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015514904478.jpg)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/20140825001551474583.png)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015514904478.jpg)
试题分析:(1)根据球的重力的作用效果,把重力分解为垂直斜面和垂直挡板的两个分力,如图所示。 (2分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015514904478.jpg)
由几何知识可知:
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015515211004.png)
方向垂直于斜面向下 (4分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140825/201408250015515211004.png)
方向水平向右。 (4分)
![](http://thumb2018.1010pic.com/images/loading.gif)
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