如图所示的装置放在水平地面上,该装置由弧形轨道、竖直圆轨道、水平直轨道AB和倾角
的斜轨道
平滑连接而成。质量m=0.1kg的小滑块从弧形轨道离地高H=1.0m处静止释放。已知R=0.2m,LAB=LBC=1.0m,滑块与轨道AB间的动摩擦因数为μ1=0.25,与轨道BC间的动摩擦因数均为μ2=0.5,弧形轨道和圆轨道均可视为光滑,忽略空气阻力。(
,
,
)
(1)求滑块运动到圆的最高点
时速度大小和滑块对D点的压力大小;
(2)求滑块到达
点时的动能;
(3)求物体最终停在何处?离B点有多远?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799edf593e3ba2b2372a83d9782be3a2.png)
(1)求滑块运动到圆的最高点
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
(2)求滑块到达
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)求物体最终停在何处?离B点有多远?
![](https://img.xkw.com/dksih/QBM/2021/7/18/2766696147746816/2766743898841088/STEM/39717c21-19a3-4475-bb07-93c073cb1121.png?resizew=339)
20-21高一下·重庆江津·阶段练习 查看更多[2]
更新时间:2021-07-18 09:37:46
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【知识点】 应用动能定理解多段过程问题
相似题推荐
解答题
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适中
(0.65)
名校
【推荐1】如图所示,半径R=0.4m的光滑圆弧轨道BC固定在竖直平面内,轨道的上端点B和圆心O的连线与水平方向的夹角θ=30°,下端点C为轨道的最低点且与粗糙水平面相切,一根轻质弹簧的右端固定在竖直挡板上.质量m=0.1kg的小物块(可视为质点)从空中的A点以v0=
m/s的速度被水平抛出,恰好从B点沿轨道切线方向进入轨道,经过C点后沿水平面向右运动至D点时,弹簧被压缩至最短,C、D两点间的水平距离L=0.8m,已知小物块与
水平面间的动摩擦因数μ=0.5,g取10m/s2.求:
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219620166336512/2223973947482112/STEM/0d4be479-43a4-4256-bcfa-c92a45d753c3.png?resizew=243)
(1)小物块从A点运动至B点的时间;
(2)小物块经过圆弧轨道上的C点时,对轨道的压力大小;
(3)该过程中弹簧的最大弹性势能Epm
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/cef812f839622326a7d7027cc806aaeb.png)
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219620166336512/2223973947482112/STEM/4774e8fc7d004d98bf14e377af05cb50.png?resizew=4)
![](https://img.xkw.com/dksih/QBM/2019/6/6/2219620166336512/2223973947482112/STEM/0d4be479-43a4-4256-bcfa-c92a45d753c3.png?resizew=243)
(1)小物块从A点运动至B点的时间;
(2)小物块经过圆弧轨道上的C点时,对轨道的压力大小;
(3)该过程中弹簧的最大弹性势能Epm
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【推荐2】如图所示为某一游戏简化装置的示意图。
是一段长直轨道,与半径
的光滑圆弧轨道
相切与
点。
轨道末端水平,末端离地面的高度为
,圆弧
对应的圆心角
。高度
的探测板
竖直放置,离
轨道末端C点的水平距离为
,上端
与
点的高度差也为
,质量
的小滑块
可视为质点
在
轨道上运动时所受阻力恒为重力的
倍,不计小球在运动过程中所受空气阻力,
。
(1)若将小滑块从
点静止释放,求经过圆弧轨道最低
点时小滑块对轨道的作用力大小;
(2)小滑块从C点以不同的速度飞出,将打在探测板上不同位置,发现打在
、
两点时,小滑块的动能相等,求
的大小;
(3)利用(2)问所求
值,求小滑块从距
点多远处无初速释放时,打到探测板上的动能最小?最小动能为多少?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/429e1df23aa8f60d1962dca4bd0a06ae.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3c8f68436b415ef3a4a885bc077ee206.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3607714050663c99950fa962d4b0cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643e3d7a80af0f9e58caff4236e8d348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/49b50357a6545cae8348e3059312f520.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/643e3d7a80af0f9e58caff4236e8d348.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ccc94f2ea411c691d91a4fc6665c24ce.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fd995178601c2ad7b40f973d268c7bb7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/04582116cd765fcc5a52f44279ad6c94.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4646418552dc060ebda1232361a01295.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135585680f39a0765c519616f61c4d3b.png)
(1)若将小滑块从
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)小滑块从C点以不同的速度飞出,将打在探测板上不同位置,发现打在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/2a30f3a8b673cc28bd90c50cf1a35281.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
(3)利用(2)问所求
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0c88d9142df6ba8e43c1a93bd04a1362.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://img.xkw.com/dksih/QBM/2021/2/28/2667827147718656/2668433720606720/STEM/96ad4398-0c1f-4147-ad7e-c80d5726470b.png?resizew=351)
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