![](https://staticzujuan.xkw.com/quesimg/Upload/formula/be6a6301878fed2a01413020b27310a5.png)
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![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f234943e3085040b41487ab1700cd04a.png)
(1)若P从斜面高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
(2)若P从斜面高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
(3)若P从斜面高
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fe8178b450c1f5ec1f88a8feef3428e2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e30680dc00c35b2463e30e09c8f9ef71.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6967ec3aaf9e7e6a9d90533b8ff61d10.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/079ff02dac695f5aefcf3142e5e067d4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/db3e3e3913abb7387a51f68349b0e87f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f234943e3085040b41487ab1700cd04a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
A.施力前弹簧压缩量为![]() |
B.外力做的功为![]() |
C.物块第一次向下运动到A点时的速度大小为![]() |
D.物块在A点上方运动的总路程为![]() |
(1)物块运动的总时间;
(2)若水平拉力F增大为原来的两倍,物块仍通过4x的距离后停止,拉力作用时间?
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7d92e9077081dc4556e4e8a78fad749e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/efdb55159c7dedb1a397b6c3eed0fcc9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594a9c33a588802263d538d5244240ee.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/92864721d0424f4ed9aaecf6db3797e9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a831fae871c9028a347e59294f7422ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5efb309e3a38635f2b8d82777854bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/87dc2477d8ad9adf4d690e10557d665d.png)
(1)运动员离开平台瞬间的速度大小;
(2)运动员第一次运动到圆弧滑道最低点B时,受到的支持力大小;
(3)为保证运动员不从A点滑离圆弧滑道,运动员与CD段之间动摩擦因数的最小值。
5 . 如图所示,一个可视为质点、质量m=1kg的小物块,从平台上的A点以的初速度水平抛出,恰好无碰撞地从C点进入固定光滑圆弧轨道,最后小物块滑上紧靠轨道末端D点的质量M=2kg的长木板,并恰好能到达长木板的左端。已知长木板的上表面与圆弧轨道末端的切线相平,圆弧轨道的半径
,圆弧轨道对应的圆心角为θ,小物块与长木板间的动摩擦因数
,长木板与地面间的动摩擦因数
,不计空气阻力,取重力加速度大小
,sinθ=0.8。求:
(1)小物块滑上长木板时的速度大小;
(2)小物块与长木板间因摩擦产生的热量Q。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1d523cdff1e630784732f5cd8504570b.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1552707683293dcf684d101dd09b5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a3607714050663c99950fa962d4b0cfb.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7ab27e74ea44e43009d22efbf1b0fff7.png)
(1)A、B的质量之比
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f48ea71f6efd422ab227eb1a622b498.png)
(2)弹簧最初的压缩量x;
(3)物块A与斜面间的动摩擦因数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
![](https://img.xkw.com/dksih/QBM/editorImg/2023/12/15/674a3b49-9af8-4cbb-99f5-8f454d4117f8.png?resizew=419)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f4be84082191b3aa6399cfe3a51205c4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e3e21f8038beac8297ef2bf46d8cb3a7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/14ebc630fb95e8cb5cc9fa8b0f7cf1ca.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f60c5e0cb98bd6eb8e1e1451bba5056a.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a831fae871c9028a347e59294f7422ec.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a2d6d4ec1097a4ff901bfa649a2af119.png)
(1)A与B相撞前A的速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f44c235d8b49207ad3f2d77dc5d6cf20.png)
(2)A与B相撞后向右做加速运动的位移
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ae9ab1621cd729a18b2173e95d557376.png)
(3)要使C最终不脱离木板,每块木板的长度至少应为多少?
8 . 如图所示,质量M=1kg的木板A置于光滑斜面上,左端放有质量m=1.5kg的物块B(可视为质点),A、B之间的动摩擦因数。开始时木板右端与垂直斜面的挡板相距x0=6.4m,A、B一起以v0=6m/s的初速度沿斜面向下运动。接着木板A与挡板发生多次无机械能损失的碰撞(等速率反弹),碰撞时间不计。已知斜面倾角θ=30°,重力加速度大小g取10m/s2。
(1)求木板A与挡板碰撞前的速度大小v1;
(2)求木板A与挡板第一次碰撞后,右端与挡板之间的最大距离xm;
(3)木板A恰与挡板碰第三次时A与B分离,求木板长度L及系统损失的机械能。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7b264a8e697336e02a666ed7741cd0f8.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799edf593e3ba2b2372a83d9782be3a2.png)
(1)碰撞前物块的速度大小
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/6f58888df91890a19a1aa7511d19703f.png)
(2)A、C两点间的距离d。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/10/20/8bbdd130-e6ba-4050-b96a-f23a2c08cc21.png?resizew=242)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9d7b9d9bf0d5fc25c99170ab27fa4045.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/63ac4fd3cee85afa183f12eb0ee701b2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/011db5702ba673de12b656a2c755c540.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/37cb56707786ac45d76daba1e920daa6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/67722f940d1db0fa4f84640cdc9f3ea7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4aa471ad1b6c9907ed84d82151025b07.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/84d4d587ef4767de4e77bd32d05613d3.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/60edeca173919cd340f59e23b338be35.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/78a26855a7b39e78f733127ae9595dfa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/122fc10d49eacb9aa36bff6d7f0652f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a831fae871c9028a347e59294f7422ec.png)
(1)物块a刚开始运动时,物块a、木板的加速度大小;
(2)木板从斜面顶端运动到斜面底端的时间;
(3)物块a与木板底端B之间的最短距离。
![](https://img.xkw.com/dksih/QBM/editorImg/2023/9/19/e7385d35-801d-4b20-b1f4-0139e8a50980.png?resizew=251)