题目内容
(1)物体
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425500202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
(2)物体
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425500202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425563210.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425578204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425563210.gif)
(3)物体
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425500202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425500202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154256414696.jpg)
(1)
(2)
(3)![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425687543.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425672534.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425672697.gif)
(3)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425687543.gif)
(1)物体P从A下滑经B到C过程中根据动能定理:
(3分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154257191131.gif)
(3分)
经
点时
(3分)
根据牛顿第二定律,
对
点的压力
(1分)
(2))从
到
机械能守恒
(2分)
与
间高度差
(1分)
(3)物体
最后在
与其等高的圆弧轨道上来回运动时,经
点压力最小,由
到
根据机械能守恒
(3分)
(2分)
根据牛顿第三定律 压力
(1分)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154257031507.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154257191131.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425781625.gif)
经
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154258281005.gif)
根据牛顿第二定律,
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425500202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425672534.gif)
(2))从
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425578204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425906720.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425578204.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425563210.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425672697.gif)
(3)物体
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425500202.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425999206.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425999206.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425516205.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115426280793.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115426296838.gif)
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/201408241154263111089.gif)
根据牛顿第三定律 压力
![](http://thumb.1010pic.com/pic2/upload/papers/20140824/20140824115425687543.gif)
![](http://thumb2018.1010pic.com/images/loading.gif)
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