当前位置:首页>文档>专题42 实验:验证动量守恒定律_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42 实验:验证动量守恒定律_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42 实验:验证动量守恒定律_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42 实验:验证动量守恒定律_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42 实验:验证动量守恒定律_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 42 实验:验证动量守恒定律 1.[2022·广东省六校第三次联考]一个物理学习小组利用图甲所示的装置和手机拍摄的 连拍功能(相邻两张照片拍摄的时间间隔相同)来验证动量守恒定律.其实验步骤如下: a.用天平测出A、B两个小球的质量m 、m (m >m ); A B A B b.把坐标纸紧贴在木板上,固定木板和斜槽在同一竖直面上,使斜槽末端保持水平, 调整好手机的位置使摄像头正对坐标纸; c.让入射小球在斜槽上的P点由静止释放,小球离开斜槽后,启动手机连拍功能进行 拍摄,选择小球在空中运动时的相邻两张照片,在坐标纸上记录下小球的位置,如图乙所 示; d.更换新的坐标纸,将被碰小球放在斜槽末端, ________________________________________________________________________ ________________________________________________________________________; e.两小球离开斜槽后,再次启动手机连拍功能进行拍摄,选择两球同时在空中运动时 的相邻两张照片,在坐标纸上记录小球的位置,如图丙所示; 根据实验回答以下问题: (1)把实验d补充完整; (2)实验中放在斜槽末端的小球是________(选填“A”或“B”); (3)若小球碰撞过程中动量守恒,则成立的表达式为:________________(从 “m ”“m ”“x”“y”“x”“y”“x”“y”中选择恰当的物理量表示). A B 0 0 1 1 2 2 2.[2020·全国卷Ⅰ]某同学用如图所示的实验装置验证动量定理,所用器材包括:气垫 导轨、滑块(上方安装有宽度为d的遮光片)、两个与计算机相连接的光电门、砝码盘和砝 码等. 实验步骤如下:(1)开动气泵,调节气垫导轨,轻推滑块,当滑块上的遮光片经过两个光电门的遮光时 间________时,可认为气垫导轨水平; (2)用天平测砝码与砝码盘的总质量m、滑块(含遮光片)的质量m; 1 2 (3)用细线跨过轻质定滑轮将滑块与砝码盘连接,并让细线水平拉动滑块; (4)令滑块在砝码和砝码盘的拉动下从左边开始运动,和计算机连接的光电门能测量出 遮光片经过A、B两处的光电门的遮光时间 Δt 、Δt 及遮光片从A运动到B所用的时间 1 2 t ; 12 (5)在遮光片随滑块从A运动到B的过程中,如果将砝码和砝码盘所受重力视为滑块所 受拉力,拉力冲量的大小I=______,滑块动量改变量的大小Δp=______;(用题中给出的 物理量及重力加速度g表示) (6)某次测量得到的一组数据为:d=1.000 cm,m =1.50×10-2 kg,m =0.400 kg, 1 2 Δt =3.900×10-2 s,Δt =1.270×10-2 s,t =1.50 s,取 g=9.80 m/s2.计算可得 I= 1 2 12 ________ N·s,Δp=________ kg·m·s-1;(结果均保留3位有效数字) (7)定义δ=×100%,本次实验δ=________%(保留1位有效数字). 3.[2022·江苏省徐州市期中抽测]某同学利用气垫导轨上滑块间的碰撞来验证动量守恒 定律,滑块1上安装遮光片,光电计时器可以测出遮光片经过光电门的遮光时间,滑块质 量可以通过天平测出,实验装置如图甲所示. (1)游标卡尺测量遮光片宽度如图乙所示,其宽度d=________ cm. (2)打开气泵,待气流稳定后,将滑块1轻轻从左侧推出,发现其经过光电门1的时间 比光电门2的时间短,应该调高气垫导轨的________端(填“左”或“右”),直到通过两 个光电门的时间相等,即轨道调节水平. (3)在滑块上安装配套的粘扣.滑块2(未安装遮光片,质量m =120.3 g)静止在导轨上, 2 轻推滑块1(安装遮光片,质量m =174.5 g),使其与滑块2碰撞,记录碰撞前滑块1经过 1 光电门1的时间Δt,以及碰撞后两滑块经过光电门2的时间Δt.重复上述操作,多次测 1 2 量得出多组数据如下表: Δt/ms 64.72 69.73 70.69 80.31 104.05 1 /s-1 15.5 14.3 14.1 12.5 9.6 Δt/ms 109.08 121.02 125.02 138.15 185.19 2 /s-1 9.2 8.3 8.0 7.2 5.4 根据表中数据在方格纸上作出图线.若根据图线得到的斜率 k 数值近似等于k = 1 2 ________.(用m、m 表示)即可验证动量守恒定律. 1 2(4)多次试验,发现k 总大于k,产生这一误差的原因可能是________. 1 2 A.滑块2的质量测量值偏大 B.滑块1的质量测量值偏大 C.滑块2未碰时有向右的初速度 D.滑块2未碰时有向左的初速度
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  1. CONNECT:[ UseTime:0.001112s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001542s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000799s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000700s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001458s ]
  6. SELECT * FROM `set` [ RunTime:0.000658s ]
  7. SHOW FULL COLUMNS FROM `wendang` [ RunTime:0.001629s ]
  8. SELECT * FROM `wendang` WHERE `id` = 369055 LIMIT 1 [ RunTime:0.003998s ]
  9. UPDATE `wendang` SET `liulancishu` = 1 WHERE `id` = 369055 [ RunTime:0.001527s ]
  10. UPDATE `wendang` SET `lasttime` = 1773086469 WHERE `id` = 369055 [ RunTime:0.001329s ]
  11. SELECT * FROM `wendang` WHERE `id` < 369055 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.002409s ]
  12. SELECT * FROM `wendang` WHERE `id` > 369055 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.004431s ]
  13. SELECT * FROM `wendang` WHERE `id` <> 369055 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.024186s ]
  14. SELECT * FROM `wendang` WHERE `id` <> 369055 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.021365s ]
  15. SELECT * FROM `wendang` WHERE `id` <> 369055 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.034512s ]
0.260620s