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第1部分专题2微专题2 板块模型的综合分析_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)_学生版_大二轮专题复习讲义

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第1部分专题2微专题2 板块模型的综合分析_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)_学生版_大二轮专题复习讲义
第1部分专题2微专题2 板块模型的综合分析_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)_学生版_大二轮专题复习讲义

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微专题 2 板块模型的综合分析 命题规律 1.命题角度:(1)牛顿运动定律在板块模型中的应用;(2)动量定理及动量守恒定 律在板块模型中的应用;(3)能量观点在板块模型中的应用.2.常用方法:假设法、整体法与 隔离法.3.常考题型:选择题、计算题. 1.用动力学解决板块模型问题的思路 2.滑块和木板组成的系统所受的合外力为零时,优先选用动量守恒定律解题;若地面不光 滑或受其他外力时,需选用动力学观点解题. 3.应注意区分滑块、木板各自相对地面的位移和它们的相对位移.用运动学公式或动能定 理列式时位移指相对地面的位移;求系统摩擦生热时用相对位移(或相对路程). 例1 (2022·广东省模拟)如图甲所示,一右端固定有竖直挡板的质量 M=2 kg的木板静置于 光滑的水平面上,另一质量m=1 kg的物块以v =6 m/s的水平初速度从木板的最左端P点 0 冲上木板,最终物块在木板上Q点(图甲中未画出)与木板保持相对静止,物块和木板的运动 速度随时间变化的关系图像如图乙所示.物块可视为质点.求: (1)图乙中v、v 和v 的大小; 1 2 3 (2)整个过程物块与木板之间因摩擦产生的热量. ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________例2 (2022·甘肃金昌市月考)如图所示,一质量M=3 kg的小车由水平部分AB和光滑圆轨 道BC组成,圆弧BC的半径R=0.4 m且与水平部分相切于B点,小物块Q与AB段之间的 动摩擦因数μ=0.2,小车静止时左端与固定的光滑曲面轨道MN相切,一质量为m =0.5 kg 1 的小物块P从距离轨道MN底端高为h=1.8 m处由静止滑下,并与静止在小车左端的质量 为m =1 kg的小物块Q(两物块均可视为质点)发生弹性碰撞,碰撞时间极短.已知除了小车 2 AB段粗糙外,其余所有接触面均光滑,重力加速度g=10 m/s2. (1)求碰撞后瞬间物块Q的速度; (2)求物块Q在小车上运动1 s时相对于小车运动的距离(此时Q未到B点且速度大于小车的 速度); (3)要使物块Q既可以到达B点又不会从小车上掉下来,求小车左侧水平长度AB的取值范围. ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ (2022·广东湛江市模拟)在光滑水平面上有一质量为2m、足够长的小车,小车左端锁定着一 块质量为m的木板,两者一起以的速度匀速向右运动.现有一颗质量也为m的子弹以v 的 0 水平初速度从同一方向射入木板.若子弹在木板运动过程中所受到的阻力为恒力且等于其自 身重力,重力加速度取g. (1)子弹恰好不从木板中穿出,则木板的长度L为多少? (2)取木板的长度为,解除对木板的锁定,如果子弹在木板内运动过程中,木板相对小车发 生滑动,要使子弹不能从木板中射出,则木板与小车间的动摩擦因数μ应满足什么条件? ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________ ____________________________________________________________________________
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  1. CONNECT:[ UseTime:0.000558s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000579s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000312s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000299s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000518s ]
  6. SELECT * FROM `set` [ RunTime:0.000255s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.000632s ]
  8. SELECT * FROM `wendang` WHERE `id` = 374001 LIMIT 1 [ RunTime:0.000451s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 374001 [ RunTime:0.006545s ]
  10. UPDATE `wendang` SET `lasttime` = 1773123687 WHERE `id` = 374001 [ RunTime:0.000505s ]
  11. SELECT * FROM `wendang` WHERE `id` < 374001 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000436s ]
  12. SELECT * FROM `wendang` WHERE `id` > 374001 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000611s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 374001 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003556s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 374001 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002127s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 374001 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.001874s ]
0.089386s