![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9e0d4900a926bf08be223b4bedd8801c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d36ac895ed357adb594af562dab982b4.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/4d9e99383eab31f340af2991bfe5ae9f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7bbd9fd0f7f5c54bcc58babaaed1c5b0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7dd23353d1a4897ff868aeea01fcf9c0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bebd9b690f348a3c829d7fa5e18e1f5f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ef5cb62f5a011e245ef78e07a2fe5cfd.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad4ff1bcddac0c520ff4d9de3f460aab.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/46a6a294d3d7206bcdde5b943dbe94f0.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
(1)在长木板与底座相碰前,长木板和小滑块加速度的大小;
(2)小滑块到达A点时速度的大小;
(3)小滑块在斜面上滑动的时间t。
(1)斜面的长度x及物块与地面间的动摩擦因数μ;
(2)斜面的倾角θ的正弦值。
A.![]() | B.![]() |
C.![]() | D.![]() |
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b6c96cb3ac8290e09c55d4eb336a8608.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/19d4166fee97516ad1b1d4759a8e4ce6.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/9c966f27a3d80f2f7ead4453f12ff8ff.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1b6af5ccb9de1c326e7d7cd3878afb0f.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f06d7dc5407015377158ba5251a3d0ec.png)
(1)泡沫球沿斜面下滑时加速度
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e72adb45c60c2f63b46e65ff787302bf.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/3e88093a749c0d46e0ee931ecfaff925.png)
(2)泡沫球到达B时的速度大小;
(3)玩家得分最高的情况下,所选择BC的距离。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c24095e409b025db711f14be783a406c.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d88ba3d0504435e2c5087acc144a682d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/eaf05975a6d6f0da58615741a3d59dfc.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799edf593e3ba2b2372a83d9782be3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
(1)求杆对球的支持力的大小和方向;
(2)若风力F作用0.5s后撤去,求小球上滑过程中距A点的最大距离;
(3)若球与杆之间的动摩擦因数可以改变,求当摩擦因数超过多少时,无论吹多大的风,球都将在A点保持静止。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/594a9c33a588802263d538d5244240ee.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/666ac5c50dbe7c30bc8b60d7f7b1b371.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1f328ba89c0a92a4447788b65571f7aa.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/276509f01529d982ab21e479a4619268.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/bf189a86ac788e61722281a7b1ed7b8e.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/e5efb309e3a38635f2b8d82777854bd7.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/ad1e9428c0b50966fe5fe32920468312.png)
(1)小孩滑到
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/b3702da8f39e362c7fc0acdddb8de103.png)
(2)两小孩玩闹,甲在
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7f9e8449aad35c5d840a3395ea86df6d.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/a0ed1ec316bc54c37c4286c208f55667.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/c55ec3fc6a2a218803229a6fe3ab2679.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/8141d00b74eb4c50bf861e6ff0edf137.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/799edf593e3ba2b2372a83d9782be3a2.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/f986badfc5dea707c164e2ab6c98dd06.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/fb8485466d2127bd681a322f87c58f86.png)
(1)人沿斜面滑行时的加速度大小;
(2)人滑至斜面底端时的速度大小。
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/5fda5655ef480683a2d3b74f0b523439.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/d1552707683293dcf684d101dd09b5c9.png)
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/da73bea1931f00b462c58a3c9a1335f6.png)
(1)从图乙分析
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/7aeb9a94e392f6759b18abed89aacc5e.png)
(2)雪橇与斜面间的动摩擦因数
![](https://staticzujuan.xkw.com/quesimg/Upload/formula/1100379a4385b9ce064847bc21760adc.png)
(3)空气阻力与速度的比值k。
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/8/c4b25935-278f-4887-ace1-8e36721b6564.png?resizew=297)
9 . 用同种材料制成倾角的斜面和长水平面,斜面长
且固定,一小物块从斜面顶端以沿斜面向下的初速度
开始自由下滑,当
时,经过
后小物块停在斜面上。多次改变的大小,记录下小物块从开始运动到最终停下的时间t,作出
图像,如图所示,求:
(1)小物块在斜面上下滑的加速度为多少?
(2)小物块与该种材料间的动摩擦因数为多少?
(3)某同学认为,若小物块初速度为,则根据图像中t与
成正比推导,可知小物块从开始运动到最终停下的时间为
。以上说法是否正确?若不正确,请说明理由,并解出你认为正确的结果。
![](https://img.xkw.com/dksih/QBM/editorImg/2024/3/23/4c02ad59-06ad-420d-8789-f694997ccedf.png?resizew=299)
10 . 如图所示,以v=4m/s的速度顺时针匀速转动的水平传送带,左端与粗糙倾斜轨道在B点平滑对接,右端与放在粗糙水平地面上的长木板D上表面等高,且紧密靠近(间隙可以忽略不计),相同长木板E与D接触但不粘连,每块木板长L=1.2m、质量M=0.2kg。质量m=0.1kg的小物块(可以看做质点)从倾斜轨道上高h=3m处的A点由静止开始下滑,经过传送带后滑上木板D。物块与倾斜轨道间的动摩擦因数,物块与传送带和木板之间的动摩擦因数均为
,木板D、E与地面间的动摩擦因数
。倾斜轨道与水平面的夹角θ=37°,传送带BC之间的距离d=8m。已知sin37°=0.6,cos37°=0.8,重力加速度
,最大静摩擦力等于滑动摩擦力。
(1)求物块到达B点时的速度大小;
(2)求物块从B点运动到C点的总时间t;
(3)物块最终能否停在木板上?如果能,求出物块最终停在哪块木板上,及距此木板左端多远的距离;如果不能,请通过计算说明理由。