当前位置:首页>文档>专题17用牛顿第二定律解决瞬时问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

专题17用牛顿第二定律解决瞬时问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题17用牛顿第二定律解决瞬时问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题17用牛顿第二定律解决瞬时问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5
专题17用牛顿第二定律解决瞬时问题_4.2025物理总复习_赠品通用版(老高考)复习资料_专项复习_2023《微专题·小练习》·物理·L-5

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专题 17 用牛顿第二定律解决瞬时问题 1. [2022·重庆市检测](多选)如图所示,三个完全相同的小球甲、乙、丙,甲、乙两球用 轻绳连接,乙、丙两球用轻弹簧连接,甲球用轻绳与天花板连接,甲、乙、丙三球位于同 一竖直线上且均处于静止状态,重力加速度为 g,弹簧始终在弹性限度内,将天花板与甲 球间轻绳剪断瞬间,三个小球的加速度大小为( ) A.a =g B.a =1.5g 甲 甲 C.a =2g D.a =0 乙 丙 2. [2022·浙江省湖州市联考]如图所示,质量分别为2m、m的物块A和B通过一轻弹簧连 接,并放置于倾角为θ的光滑固定斜面上,用一轻绳一端连接 B,另一端固定在墙上,绳 与斜面平行,物块A和B静止.突然剪断轻绳的瞬间,设A、B的加速度大小分别为a 和 A a (弹簧在弹性限度内,重力加速度为g),则( ) B A.a =0,a =1.5g sin θ A B B.a =0,a =g sin θ A B C.a =0,a =3g sin θ A B D.a =a =g sin θ A B 3. 如图所示,质量分别为m、2m的球A、B由轻质弹簧相连后再用细线悬挂在正在竖直 向上做匀加速运动的电梯内,细线中的拉力为F,此时突然剪断细线,在线断的瞬间,弹 簧的弹力大小和小球A的加速度大小分别为( ) A.,+g B.,+g C.,+g D.,+g4.(多选)如图所示,物体a、b用一根不可伸长的轻细绳相连,再用一根轻弹簧和a相 连,弹簧上端固定在天花板上,已知物体a、b的质量相等,重力加速度为g.当在P点剪断 绳子的瞬间( ) A.物体a的加速度大小为零 B.物体a的加速度与物体b的加速度大小相同 C.物体b的加速度大小为零 D.物体b的加速度大小为g 5. 如图所示,天花板上固定有一光滑的定滑轮,绕过定滑轮且不可伸长的轻质细绳左端 悬挂一质量为M的铁块;右端悬挂有两质量均为m的铁块,上下两铁块用轻质细线连接, 中间夹一轻质弹簧处于压缩状态,此时细线上的张力为 2mg,最初系统处于静止状态.某 瞬间将细线烧断,则左端铁块的加速度大小为( ) A.g B.g C.g D.g 6. 如图所示,物块1、2间用刚性轻质杆连接,物块3、4间用轻质弹簧相连,物块1、3 质量为m,物块2、4质量为M,两个系统均置于水平放置的光滑木板上,并处于静止状态. 现将两木板沿水平方向突然抽出,设抽出后的瞬间,物块 1、2、3、4的加速度大小分别为 a、a、a、a.重力加速度大小为g,则有( ) 1 2 3 4 A.a=a=a=a=0 1 2 3 4 B.a=a=a=a=g 1 2 3 4 C.a=a=g,a=0,a=g 1 2 3 4 D.a=g,a=g,a=0,a=g 1 2 3 4 7.[2022·“皖豫名校联盟体”考试]如图所示,质量为m的小球在轻弹簧和水平轻绳作用 下处于静止状态,弹簧与竖直方向夹角为θ.设重力加速度为g,剪断轻绳的瞬间,小球加 速度大小和方向分别为( ) A.g,沿切线方向 B.g sin θ,沿切线方向 C.g cos θ,沿水平方向 D.g tan θ,沿水平方向
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  1. CONNECT:[ UseTime:0.000358s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000546s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.002265s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.001627s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000474s ]
  6. SELECT * FROM `set` [ RunTime:0.000197s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000593s ]
  8. SELECT * FROM `wendang` WHERE `id` = 368303 LIMIT 1 [ RunTime:0.000394s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 368303 [ RunTime:0.006959s ]
  10. UPDATE `wendang` SET `lasttime` = 1773077781 WHERE `id` = 368303 [ RunTime:0.001447s ]
  11. SELECT * FROM `wendang` WHERE `id` < 368303 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001680s ]
  12. SELECT * FROM `wendang` WHERE `id` > 368303 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000397s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 368303 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003915s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 368303 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003527s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 368303 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.009941s ]
0.106789s