如图所示,在倾角为
的足够长的固定的光滑斜面上,有一质量为
的长木板正以
的初速度沿斜面向下运动,现将一质量
的小物块(可视为质点)轻放在长木板最下端。已知物块与长木板间的动摩擦因数
,设物块与木板间最大静摩擦力等于滑动摩擦力,重力加速度g取10m
,
,
。求:
(1)放上小物块后,木板和小物块的加速度大小。
(2)要使小物块不滑离长木板,长木板至少要有多长。
(3)假设长木板长
,在轻放小物块的同时对长木板施加一沿斜面向上的
的恒力,求小物块在长木板上运动时间。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3607714050663c99950fa962d4b0cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/99c8e0fbde81935b0659d17a62223c34.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e0a159ac3c3bc70173705aea5b40eca7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e505dad079e4de42c000729f48420255.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f881cb9071ca8fea7cef4ab8d4865589.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6ced40b9b52d5691769c50c36c890325.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/135585680f39a0765c519616f61c4d3b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b58221e12691cb48d9d2ee9b0dd5239b.png)
(1)放上小物块后,木板和小物块的加速度大小。
(2)要使小物块不滑离长木板,长木板至少要有多长。
(3)假设长木板长
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1b527a3749343f84824319ca63201e8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88ba3d0504435e2c5087acc144a682d.png)
![](https://img.xkw.com/dksih/QBM/2022/6/3/2993262143070208/2994031012691968/STEM/addfa601-1d5a-4e7c-bc19-9bbd29c38b48.png?resizew=210)
更新时间:2022-06-04 12:34:36
|
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【推荐1】下暴雨时,有时会发生山体滑坡或泥石流等地质灾害。某地有一倾角为
(
)的山坡
,上面有一质量为
的石板
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上有一碎石堆
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浸透雨水后总质量也为
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、
间的动摩擦因数
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、
间的动摩擦因数
减小为0.5,
、
开始运动,此时刻为计时起点;在第1s末,
的上表面突然变为光滑,
保持不变。已知
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离
下边缘的距离
,
足够长,设最大静摩擦力等于滑动摩擦力,取重力加速度大小
。求:
(1)在0~1s时间内
和
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(2)
在
上总的运动时间。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
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(1)在0~1s时间内
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(2)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
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(0.4)
名校
【推荐2】如图所示,地面上有一固定的斜面体ABCD,其AB边的长度
,斜面倾角为370.光滑水平地面上有一块质量
的足够长的木板紧挨着斜面体静止放置.质量为
物体由A点静止滑下,然后从B点滑上长木板(由斜面滑至长木板时速度大小不变),已知物体与斜面体的动摩擦因数为0.25,物体与长木板的动摩擦因数为0.3,
,
,
.求:
![](https://img.xkw.com/dksih/QBM/2019/2/26/2148841328328704/2153857346535424/STEM/ef9a2075-a430-461b-8440-8e3e0ce9862f.png?resizew=231)
(1)物体到达斜面底端B点时的速度大小;
(2)物体从B点滑上长木板时,物体和长木板的加速度大小;
(3)物体在长木板上滑行的最大距离.
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0877995ef2a6b896fe5fec07055ace9.png)
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(1)物体到达斜面底端B点时的速度大小;
(2)物体从B点滑上长木板时,物体和长木板的加速度大小;
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名校
【推荐1】如图所示,小物块 A 质量 mA=4kg;长木板 B 质量 mB=1kg,长度 L=2.66m。初始时刻,A 在 B 左端初速度 v0=5m/s,B 静止,AB 之间的动摩擦因数μ1=0.2,B 与地面的动摩擦因数为μ2=0.1(g=10m/s2)
(1)A 在木板 B 上运动与 B 取得的共同速度多大?
(2)若 t=2s 时在 B 左端加 F=13N 的水平向左拉力,再经多长时间 A 从木板 B 滑下?
(1)A 在木板 B 上运动与 B 取得的共同速度多大?
(2)若 t=2s 时在 B 左端加 F=13N 的水平向左拉力,再经多长时间 A 从木板 B 滑下?
![](https://img.xkw.com/dksih/QBM/2020/10/3/2562926447099904/2564051898433536/STEM/e0471eca-552d-43e4-9565-30ec9dcca4e0.png?resizew=241)
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【推荐2】如图所示,质量
的长木板放置于水平地面上,其上表面光滑、下表面粗糙,可视为质点的滑块静止放在木板的上表面距木板右端
处。
时刻,给木板一个
水平向右的初速度,同时对木板施加一个
的水平向左的恒力,经一段时间,滑块从木板上掉下来。已知木板与地面间的动摩擦因数
,滑块质量
,重力加速度
。
(1)为使滑块只能从长木板右端滑出,求初始位置距木板左端的距离
应满足的条件;
(2)若滑块能从长木板右端滑出,求滑块离开长木板时,长木板的速度。
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(1)为使滑块只能从长木板右端滑出,求初始位置距木板左端的距离
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(2)若滑块能从长木板右端滑出,求滑块离开长木板时,长木板的速度。
![](https://img.xkw.com/dksih/QBM/editorImg/2022/6/15/d1703461-be17-43f5-83a8-2981ae647708.png?resizew=425)
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