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1、第二章相互作用第 1 节重力、弹力、摩擦力一、单项选择题1.以下关于物体重力的说法中不正确的选项是()A地球上的物体只有运动时才受到重力B同一物体在某处向上抛出后和向下抛出后所受重力一样大C某物体在同一位置时，所受重力与静止还是运动无关，重力大小是相同的D物体所受重力大小与其质量有关2.一个质量可以不计的弹簧，其弹力F 的大小与长度l 的关系如图中的直线a、b 所示，这根弹簧的劲度系数为()A1250 N/mB625 N/m C2500 N/mD833 N/m 3.如下图，轻质弹簧的劲度系数为k，小球重 G，平衡时小球在A 处今用力F 压小球至 B 处，使弹簧缩短x，则此时弹簧的弹力为()Ak
2、xBkxGCGkxD以上都不对4.(2013 山东卷)如下图，用完全相同的轻弹簧A、B、C 将两个相同的小球连接并悬挂，小球处于静止状态，弹簧A 与竖直方向的夹角为30，弹簧 C 水平，则弹簧A、C 的伸长量之比为()A.34B43 C12D21 5.如下图，人向右匀速推动水平桌面上的长木板，在木板翻离桌面以前，则()A木板露出桌面后，推力将逐渐减小B木板露出桌面后，木板对桌面的压力将减小C木板露出桌面后，桌面对木板的摩擦力将减小D推力、压力、摩擦力均不变6.(天津高考卷)如下图，A、B 两物块叠放在一起，在粗糙的水平面上保持相对静止地向右做匀减速直线运动，运动过程中B 受到的摩擦力()A方向
3、向左，大小不变B方向向左，逐渐减小C方向向右，大小不变D方向向右，逐渐减小7.(2013 株洲模拟)如下图，小车内有一固定光滑斜面，一个小球通过细绳与车顶相连，细绳始终保持竖直关于小球的受力情况，以下说法正确的选项是()A假设小车静止，绳对小球的拉力可能为零B假设小车静止，斜面对小球的支持力一定为零C假设小车向右运动，小球一定受两个力的作用D假设小车向右运动，小球一定受三个力的作用8.如下图，轻弹簧的一端与物块P 相连，另一端固定在木板上先将木板水平放置，并使弹簧处于拉伸状态缓慢抬起木板的右端，使倾角逐渐增大，直至物块P 刚要沿木板向下滑动，在这个过程中，物块P 所受静摩擦力的大小变化情况是(
4、)A先减小后增大B先增大后减小C一直增大D保持不变9.(江苏高考卷改编)如下图，倾角为的等腰三角形斜面固定在水平面上，一足够长的轻质绸带跨过斜面的顶端铺放在斜面的两侧，绸带与斜面间无摩擦现将质量分别为M、m(Mm)的小物块同时轻放在斜面两侧的绸带上两物块与绸带间的动摩擦因数相等，且最大静摩擦力与滑动摩擦力大小相等在角取不同值的情况下，以下说法正确的有()A两物块所受摩擦力的大小不可能总相等B两物块不可能同时相对绸带静止CM 不可能相对绸带发生滑动Dm 不可能相对斜面向上滑动二、多项选择题10.如下图，有一个重力不计的方形容器，被水平力F 压在竖直的墙面上处于静止状态，现缓慢地向容器内注水，直到
5、将容器刚好盛满为止，在此过程中容器始终保持静止，则以下说法中正确的选项是()A容器受到的摩擦力不变B容器受到的摩擦力逐渐减小C水平力F 可能不变D水平力 F 必须逐渐增大三、非选择题文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B
6、2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1
7、ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B
8、2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1
9、ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B
10、2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1
11、ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B3文档编码:CL5B2Y8D6F2 HC5C8M2Y7B1 ZR3B4F2F7B311.如下图，水平面上有一重为40 N 的物体，受到F113 N 和 F26 N 的水平力作用而保持静止已知物体与水平面间的动摩擦因数 0.2.设最大静摩擦力等于滑动摩擦力，求：
12、(1)物体所受的摩擦力的大小与方向；(2)假设只将F1撤去，物体受到的摩擦力的大小和方向12.一根大弹簧内套一根小弹簧，大弹簧比小弹簧长0.2 m，它们的下端平齐并固定，另一端自由，如下图当压缩此组合弹簧时，测得弹力与弹簧压缩量的关系如下图试求这两根弹簧的劲度系数k1和 k2.13.木块 A、B 分别重 50 N 和 60 N，它们与水平地面之间的动摩擦因数均为0.25；夹在 A、B 之间的轻弹簧被压缩了2 cm，弹簧的劲度系数为400 N/m.系统置于水平地面上静止不动现用F1 N 的水平拉力作用在木块B 上，如下图，求力F 作用后木块A、B 所受摩擦力的大小文档编码:CH6G7F2H6O5
13、 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5
14、ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文
15、档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6
16、O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A
17、5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V
18、9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2
19、H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9第 2 节力的合成与分解一、单项选择题1.如下图，重力为G 的物体静止在倾角为的斜面上，将重力G 分解为垂直斜面向下的力 F1和平行斜面向下的力F2，那么()AF1就是物体对斜面的压力B物体对斜面的压力方向与F1方向相同，大小为Gcos CF2就是物体受到的静摩擦力D物体受到重力、斜面对物体的支
20、持力、静摩擦力、F1和 F2共五个力的作用2.小明想推动家里的衣橱，但使出了吃奶的力气也推不动，他便想了个妙招，如下图，用 A、B 两块木板，搭成一个底角较小的人字形架，然后往中央一站，衣橱居然被推动了！以下说法正确的选项是()A这是不可能的，因为小明根本没有用力去推衣橱B这是不可能的，因为无论如何小明的力气也没那么大C这有可能，A 板对衣橱的推力有可能大于小明的重力D这有可能，A 板对衣橱的推力不可能大于小明的重力3.作用于同一点的两个力，大小分别为F15 N，F24 N，这两个力的合力F 与 F1的夹角为，则 可能为()A45B60C75D904.如下图，F1、F2、F3恰好构成封闭的直角
21、三角形，这三个力的合力最大的是()5.(2014 雅礼中学模拟)如下图，质量为m 的小滑块静止在半径为R 的半球体上，它与半球体间的动摩擦因数为，它与球心连线跟水平地面的夹角为，则小滑块()A所受摩擦力大小为mgcos B所受摩擦力大小为mgsin C所受摩擦力大小为 mg sin D对半球体的压力大小为mgcos 二、多项选择题6.如下图是骨折病人的牵引装置示意图，绳的一端固定，绕过定滑轮和动滑轮后挂着一个重物，与动滑轮相连的帆布带拉着病人的脚，整个装置在同一竖直平面内为了使脚所受的拉力增大，可采取的方法是()文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9
22、文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H
23、6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7
24、A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4
25、V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F
26、2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8
27、D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5
28、H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9A只增加绳的长度B只增加重物的质量C只将病人的脚向左移动D只将两定滑轮的间距增大7.在研究共点力合成实验中，得到如下图的合力与两力夹角的关系曲线，关于合力F 的范围及两个分力的大小，则以下说法中正确的选项是()A2 NF14 N B2 NF10 N C两力大小分别为2 N、8 N D两力大小分别为6 N、8 N 三、非选择题8.如下图，水平地面
29、上一重60 N 的物体，在与水平面成30 角斜向上的大小为20 N的拉力 F 作用下做匀速运动，求地面对物体的支持力和地面对物体的摩擦力大小9.如右图所示，30，装置的重力和摩擦力均不计，假设用F 100 N 的水平推力使滑块 B 保持静止，则工件上受到的向上的弹力多大？文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9
30、文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H
31、6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7
32、A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4
33、V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F
34、2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8
35、D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5
36、H4V910.如下图，AC 和 BC 两轻绳共同悬挂一质量为m 的物体，假设保持AC 绳的方向不变，AC 与竖直方向的夹角为60，改变 BC 绳的方向，试求：(1)物体能到达平衡时，角的取值范围(2)在 0 90 的范围内，求BC 绳上拉力的最大值和最小值文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6
37、G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C
38、4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X1
39、0E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:C
40、H6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR
41、5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5
42、X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9第 3
43、节受力分析、共点力作用下物体的平衡一、单项选择题1.如图为节日里悬挂灯笼的一种方式，A、B 点等高，O 为结点，轻绳AO、BO 长度相等，拉力分别为FA、FB，灯笼受到的重力为G.以下表述正确的选项是()AFA一定小于GBFA与 FB大小相等CFA与 FB是一对平衡力DFA与 FB大小之和等于G2.(2013 北京卷)倾角为、质量为M 的斜面体静止在水平桌面上，质量为m 的木块静止在斜面体上以下结论正确的选项是()A木块受到的摩擦力大小是mgcos B木块对斜面体的压力大小是mgsin C桌面对斜面体的摩擦力大小是mgsin cos D桌面对斜面体的支持力大小是(Mm)g3.用一轻绳将小球P
44、系于光滑墙壁上的O 点，在墙壁和球P 之间夹有一矩形物块Q，如下图 P、Q 均处于静止状态，则以下相关说法正确的选项是()AP 物体受 3 个力BQ 物体受到3个力C假设绳子变长，绳子的拉力将变小D假设绳子变短，Q 受到的静摩擦力将增大4.一质量为m 的物块恰好静止在倾角为的斜面上 现对物块施加一个竖直向下的恒力 F，如下图则物块()A仍处于静止状态B沿斜面加速下滑C受到的摩擦力不变D受到的合外力增大5.如下图，与水平面夹角为30 的固定斜面上有一质量m1.0 kg 的物体细绳的一端与物体相连，另一端经摩擦不计的定滑轮与固定的弹簧秤相连物体静止在斜面上，弹簧文档编码:CH6G7F2H6O5 H
45、R5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM
46、5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编
47、码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5
48、 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5
49、ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文
50、档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6O5 HR5C4G8D7A5 ZM5X10E5H4V9文档编码:CH6G7F2H6