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热点1 受力分析和物体平衡_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训

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热点1 受力分析和物体平衡_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点1 受力分析和物体平衡_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点1 受力分析和物体平衡_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点1 受力分析和物体平衡_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训
热点1 受力分析和物体平衡_4.2025物理总复习_赠品通用版(老高考)复习资料_二轮复习_2023年高考物理二轮复习讲义+课件(全国版)_2023年高考物理二轮复习讲义(全国版)_考前特训

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热点 1 受力分析和物体平衡 1.(多选)(2022·广东省模拟)如图,氢气球的质量m=0.1 kg,无风时在轻绳的牵引下静止在 空中,此时轻绳的拉力为8 N.当有水平风吹来时,气球受到大小为6 N的水平风力作用, 轻绳倾斜一定角度后气球仍静止在空中,g=10 m/s2,下列说法正确的是( ) A.气球所受浮力大小为9 N B.有风时,气球所受合力方向竖直向下 C.有风时,气球所受合力大小为 N D.有风时,轻绳的拉力大小为10 N 答案 AD 解析 无风时,对气球受力分析得F =mg+F =9 N,A正确;有风时,气球保持静止, 浮 T 故所受合力为零,B、C错误;有风时,对气球受力分析得 F =F ′sin θ,F =mg+ 风 T 浮 F ′cos θ,联立解得F ′=10 N,D正确. T T 2.(2022·广西南宁市二模)表面光滑的四分之一圆柱体紧靠墙角放置,其横截面如图所示. 细绳一端固定在竖直墙面上P点,另一端与重力为G的小球A连接,A在圆柱体上保持静 止.测得悬点P与小球球心的距离为1.2 m,P与圆柱体圆心O的距离为1.5 m.则绳子在 P点对墙的拉力大小等于( ) A.0.6G B.0.8G C.G D.1.5G 答案 B 解析 对球A受力分析如图所示,因A静止,将A的重力G分解,由三角形相似得== 0.8,得F =0.8G,绳子在P点对墙的拉力大小也等于0.8G,B正确. T3.(2022·安徽合肥市质检)图为挂在架子上的双层晾衣篮的结构示意图.上、下篮子完全相 同且保持水平,每个篮子由两个质地均匀的圆形钢圈穿进网布构成,两篮通过四根等长的 轻绳与钢圈的四等分点相连,上篮钢圈用另外四根等长轻绳系在挂钩上.晾衣篮的有关尺 寸如图所示,则图中上、下层各一根轻绳的张力大小之比为( ) A.1∶1 B.2∶1 C.5∶2 D.5∶4 答案 C 解析 设一个篮子的质量为m,连接下篮的每根轻绳的张力大小为F ,对下篮,根据平衡 T2 条件得4F =mg,解得F =;设连接上篮的每根轻绳的张力大小为 F ,轻绳与竖直方向 T2 T2 T1 夹角为θ,对晾衣篮整体由平衡条件得4F cos θ=2mg,根据题图以及几何关系得sin θ= T1 =0.6,则cos θ=0.8,联立解得F =mg,则=,故C正确,A、B、D错误. T1 4.(2022·河北石家庄市质检)如图,一倾斜轻杆的上端固定于天花板上的O点,另一端固定 一定质量的小球A,小球A通过细线与另一小球B相连,整个装置在竖直面内处于静止状 态.现对小球B施加水平向右的外力F,使它缓慢移动到细线与杆在一条直线上的位置. 对此过程下列说法正确的是( ) A.细线张力逐渐变小 B.水平外力F逐渐减小 C.轻杆的弹力逐渐增大 D.细线与轻杆共线时,轻杆对球A的弹力一定沿杆向上 答案 C 解析 设细线与竖直方向夹角为θ,对小球B受力分析可知F cos θ=m g,F sin θ=F,则 T B T随着θ角逐渐变大,则细线张力F 逐渐变大,水平外力F逐渐变大,选项A、B错误;对 T A、B的整体受力分析,得轻杆的弹力大小F =,可知随着F的增大,轻杆的弹力逐渐增 N 大,选项C正确;细线与轻杆共线时,对球A受力分析可知,球A受到竖直向下的重力和 细线对A沿杆向下的拉力,则轻杆对球A的弹力方向沿着球A的重力与细线对A的拉力的 合力的反方向,可知轻杆对球A的弹力不是沿杆向上,选项D错误. 5.(多选)(2022·广东省模拟)如图所示细线的上端系在墙上的A点,下端连一光滑小球B(视为 质点),圆柱体静置于粗糙水平地面上,细线恰好与圆柱体相切于B.现对圆柱体施加一水平 向右的拉力,使之沿地面缓慢向右移动,直至小球B到达C点,则在该过程中( ) A.细线的拉力增大 B.圆柱体对小球的支持力增大 C.地面对圆柱体的支持力增大 D.地面对圆柱体的摩擦力大小不变 答案 BC 解析 小球B的受力情况如图所示 圆柱体向右移动的过程中,小球位置升高,细线与竖直方向的夹角增大,圆柱体对小球的 支持力与竖直方向的夹角θ减小,故细线的拉力F 减小,圆柱体对小球的支持力F 增大, T N A 错误,B 正确;B 对圆柱体的压力 F ′(F ′与 F 大小相等)的竖直分力大小 F = N N N Ny F ′cos θ,当θ减小时F 增大,使得地面对圆柱体的支持力增大,C正确;地面对圆柱 N Ny 体的摩擦力大小F=μ(F +G),其中G为圆柱体的重力,可知地面对圆柱体的摩擦力增大, f Ny D错误. 6.(2022·山西太原市一模)如图,圆环被竖直固定,两个质量均为m的带电小球A、B套在圆 环上处于静止状态.A球带正电、位于圆环圆心O的正下方,B球光滑,两球连线与竖直方向成30°角.设A受到的最大静摩擦力等于滑动摩擦力,重力加速度为g,则( ) A.圆环对B球的弹力方向由O指向B B.A球与圆环间的动摩擦因数不小于 C.圆环对B球弹力的大小为mg D.圆环对A球弹力的大小为2.5mg 答案 D 解析 若B球带负电,则A对B为吸引力,方向沿BA方向,此时无论圆环给B球的支持 力指向圆心还是背离圆心,B球都不能处于平衡状态,所以A球对B球为排斥力,方向沿 AB方向,如图所示,且对B球受力分析可得,圆环对B球的支持力指向圆心,即由B指向 O,故A错误;由几何关系可知圆环对B球弹力的大小为F =mg,则A、B两球之间的排 N 斥力大小为F =2mgcos 30°=mg,对A球受力分析,可得F ′=mg+F cos 30°=2.5mg, AB N AB F=F sin 30°=,所以当F=μF ′时,动摩擦因数最小,为μ=,故B、C错误,D正确. f AB f N 7.(2022·河北邢台市高三期末)如图所示,竖直墙壁AB与斜面BC的夹角为53°,质量均为m 且分布均匀的半球与小球叠放在墙面与斜面之间,OO′⊥BC.重力加速度大小为g,取sin 53°=0.8,cos 53°=0.6,不计一切摩擦.半球对墙壁的弹力大小为( ) A.mg B.mg C.mg D.mg 答案 B 解析 小球的受力情况如图甲所示, 可得墙壁对小球的弹力大小为 F ==mg N1半球和小球整体的受力情况如图乙所示, 墙壁对整体的弹力大小为 F ==mg N13 故墙壁对半球的弹力大小为 F =F -F =mg N3 N13 N1 根据牛顿第三定律,半球对墙壁的弹力大小为mg,故选B.
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  1. CONNECT:[ UseTime:0.000502s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000644s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000314s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000271s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000472s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000559s ]
  8. SELECT * FROM `wendang` WHERE `id` = 372514 LIMIT 1 [ RunTime:0.000433s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 372514 [ RunTime:0.001495s ]
  10. UPDATE `wendang` SET `lasttime` = 1773108968 WHERE `id` = 372514 [ RunTime:0.002345s ]
  11. SELECT * FROM `wendang` WHERE `id` < 372514 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000472s ]
  12. SELECT * FROM `wendang` WHERE `id` > 372514 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003397s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 372514 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000841s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 372514 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000830s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 372514 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001517s ]
0.086636s