如图所示,在车厢和地面之间搭块木板,构成一个倾斜的面,车厢离地面高度
。箱子体积很小,可以看做质点,箱子质量
。箱子从木板顶端静止释放,滑到斜面底端时速度不可以超过
。为了计算木板至少需要多长,小珂同学把木板平放在水平地面上,箱子放在木板上,发现用
的水平推力恰能使箱子做匀速运动(木板没有滑动,
)
(1)求箱子与木板间的动摩擦因数;
(2)求木板至少需要多长;
(3)若滑到斜面底端速度恰为
,箱子与地面的动摩擦因数为0.5,箱子从斜面进入水平面时,只保留水平分速度,求箱子从静止释放到在水平地面上停止所用的时间。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0378d2e834ba3e22e99cde184fc8b390.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/01edf63edae42eaece27c10bc46d0e2a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8f13b1f32b017808595ede26e351354f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8a4dab380fead56502303025bf30e29a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a831fae871c9028a347e59294f7422ec.png)
(1)求箱子与木板间的动摩擦因数;
(2)求木板至少需要多长;
(3)若滑到斜面底端速度恰为
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6196cf17c17eb7b94ef4b963942a0680.png)
![](https://img.xkw.com/dksih/QBM/2021/5/19/2724288002039808/2725127239032832/STEM/10c94aa0-1980-44de-8c96-788da05f9f37.png?resizew=247)
更新时间:2021-05-20 14:28:28
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【推荐1】如图甲所示,在粗糙水平面上静止放置一个截面为直角△ABC的斜劈,将一个质量为m = 1kg的物块放置在该斜劈的斜面上,物块恰好匀速下滑,斜劈仍静止,已知AC = 4m,BC = 3m,g = 10m/s2。
(1)求物块与斜面间的动摩擦因数;
(2)若换成倾角为β = 45°的相同材质的直角三角形斜劈,质量为M = 2kg。如图乙所示,底边AC长度保持不变,求该物块从斜劈(仍静止)顶端由静止开始下滑到底端的时间和加速度的大小。
(1)求物块与斜面间的动摩擦因数;
(2)若换成倾角为β = 45°的相同材质的直角三角形斜劈,质量为M = 2kg。如图乙所示,底边AC长度保持不变,求该物块从斜劈(仍静止)顶端由静止开始下滑到底端的时间和加速度的大小。
![](https://img.xkw.com/dksih/QBM/2021/1/22/2641624325873664/2644523836260352/STEM/54c3d4e3-3fb9-4a97-8f8b-f93b3b574c94.png)
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【推荐2】如图甲所示,倾角为
的斜面足够长,质量m=1kg的滑块,从斜面底端
的初始速度冲上斜面,前ls内
的图像如图乙所示,重力加速度g取10
。求
(1)滑块沿斜面上滑的最大距离;
(2)滑块与斜面间的动摩擦因数。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8e497b105f77b4bd04bdbcadb34da48a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ba05c5c88172dab89effd74756b0f1d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1552707683293dcf684d101dd09b5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/720cd3a465f0dbe15475b3e61e0c0666.png)
(1)滑块沿斜面上滑的最大距离;
(2)滑块与斜面间的动摩擦因数。
![](https://img.xkw.com/dksih/QBM/2021/12/28/2882183753433088/2882361004900352/STEM/ea6fae7a-75e3-43cf-aad5-b02428b3462a.png?resizew=311)
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【推荐1】如图所示,粗糙水平面与半径
的光滑圆弧轨道相切于B点。静止于A处
的物体在大小为10N、方向与水平面成37°角的推力 F作用下沿水平面运动,到达B点时立刻撤去F,物体沿光滑圆弧向上冲并越过C点,然后返回经过B处的速度
.已知
,
,
,
,不计空气阻力。求:
![](https://img.xkw.com/dksih/QBM/2015/5/5/1575748006248448/1575748084834304/STEM/5b3e2107-c601-411f-916e-8920d6d743f5.png?resizew=288)
(1)物体到达C点时对轨道的压力;
(2)物体与水平面间的动摩擦因数
。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5434d48bebaa5a1a09672dd7ac3d7060.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4681caf828186e28ef4366cf5beda69f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d28fc2f1bad9fabd883cc8ecb022a693.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d16ec3d3d87c80fa86488173ce0f4291.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a6a294d3d7206bcdde5b943dbe94f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4352284111ee5908d95c1aa351974a0e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a6da4a3e6edfcc181386b0d6fe3e6e21.png)
![](https://img.xkw.com/dksih/QBM/2015/5/5/1575748006248448/1575748084834304/STEM/5b3e2107-c601-411f-916e-8920d6d743f5.png?resizew=288)
(1)物体到达C点时对轨道的压力;
(2)物体与水平面间的动摩擦因数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
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【推荐2】如图所示,竖直平面内一倾角为
的粗糙倾斜直轨道
与光滑圆弧轨道
相切于
点,圆弧轨道与传送带水平段平滑连接于
点。一质量为
的小滑块从
点静止释放,经
点最后从
点水平滑上传送带。已知
点离地高度为
,
长
,滑块与
间的动摩擦因数为
,与传送带间的动摩擦因数为
,
长度为
,圆弧轨道半径为
。若滑块可视为质点,全程不计空气阻力,
,
,求:
(1)小滑块经过
点时对轨道的压力;
(2)当传送带以顺时针方向
的速度转动时,小滑块从水平传送带右端
点水平抛出后,落地点到
点的水平距离。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.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/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c94964a5c114f404d3ebee470458c4a1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/69e5a2c958cd08400c8ce1a03757deb2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fc63eaa5f6f70c39014234999e458051.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f52a58fbaf4fea03567e88a9f0f6e37e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3639b9b596019a23574b1dc4bf3e0ade.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c9d3a0e4fedc6b947e69968cb83ef875.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/760b4a67661d1fda6285fad7e99362f4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/59184d6ca2499b573e99b3b211ca75e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
(1)小滑块经过
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
(2)当传送带以顺时针方向
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/751602513a1c69c4c0134b07460e67dc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://img.xkw.com/dksih/QBM/2021/7/22/2769586293530624/2770299385110528/STEM/d8b98955-58f0-4188-becc-befb29078c82.png?resizew=419)
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【推荐3】如图所示,质量
小物块,放在半径
的水平圆盘边缘
处,小物块与圆盘的动摩擦因数
。圆心角为
,半径
的光滑圆弧轨道
与水平轨道光滑连接于
点,小物块与水平轨道的动摩擦因数为
。开始圆盘静止,在电动机的带动下绕过圆心
的竖直轴缓慢加速转动,某时刻小物块沿纸面水平方向飞出(此时
与
连线垂直纸面),恰好沿切线进入圆弧轨道
处,经过圆弧
进入水平轨道
,在
处进入圆心为
,半径为
光滑竖直圆轨道,绕过圆轨道后沿水平轨道
向右运动。设最大静摩擦力等于滑动摩擦力,
,
,
取
,求:
(1)圆盘对小物块
做的功;
(2)小物块刚离开圆盘时A、
两点间的水平距离;
(3)假设竖直圆轨道可以左右移动,若发现最终小物块能高于圆心但不能通过竖直圆轨道,求竖直圆轨道底端
与圆弧轨道底端
之间的距离范围。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/348ce836848895cea9feb93d5c02bd41.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d7cd9ed4ad401d813dd3c46f5017593b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3048351fc48b73865c2dda9a3d6f606e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594a9c33a588802263d538d5244240ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5059d11f6a732ce9b1b9bf72c69ed636.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/0dc5c9827dfd0be5a9c85962d6ccbfb1.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4ca88bfff5fb6646b794fd356729cc9d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/23f919bd3dde10dbbc076f7ec5149699.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5963abe8f421bd99a2aaa94831a951e9.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/9d78abbad68bbbf12af10cd40ef4c353.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6dacb04fa29178c0af4353e4369a7e69.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d392a74f54429f1f5bc916cc12e95086.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d004d2d115b477ade6af7ddb93db0df8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87dc2477d8ad9adf4d690e10557d665d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5efb309e3a38635f2b8d82777854bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b1eebd522c4de12f8255e649d3145d51.png)
(1)圆盘对小物块
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/294f5ba74cdf695fc9a8a8e52f421328.png)
(2)小物块刚离开圆盘时A、
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
(3)假设竖直圆轨道可以左右移动,若发现最终小物块能高于圆心但不能通过竖直圆轨道,求竖直圆轨道底端
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8455657dde27aabe6adb7b188e031c11.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c5db41a1f31d6baee7c69990811edb9f.png)
![](https://img.xkw.com/dksih/QBM/2021/5/18/2730775939710976/2733555696558080/STEM/8db5b28a-7b15-49e3-8be2-56c47761e700.png?resizew=398)
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