当前位置:首页>学习笔记>【26版物理步步高同步人教版学习笔记必修第一册第二章专题强化自由落体运动规律的综合应用

【26版物理步步高同步人教版学习笔记必修第一册第二章专题强化自由落体运动规律的综合应用

  • 2026-03-09 17:16:12
【26版物理步步高同步人教版学习笔记必修第一册第二章专题强化自由落体运动规律的综合应用

[学习目标] 1.进一步加深对自由落体运动性质的理解(重点)。2.能够灵活运用自由落体运动规律解决滴水、物体过窗等复杂问题(难点)。

一、滴水问题

1 小敏在学过自由落体运动规律后,对自家屋檐上下落的雨滴产生了兴趣,她坐在窗前发现从屋檐每隔相等时间滴下一滴水,当第5滴正欲滴下时,第1滴刚好落到地面,而第3滴与第2滴分别位于高1 m的窗子的上、下沿,小敏同学在自己的作业本上画出了如图所示的雨滴下落同自家房子的关系,其中2点和3点之间的小矩形表示小敏正对的窗子,不计空气阻力,g取10 m/s2,求:(尝试用多种方法求解)

(1)滴水的时间间隔是多少?

(2)此屋檐离地面多高?

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水滴下落类问题

像水滴下落这样从同一位置开始、间隔相等时间、依次做自由落体运动的物体在空间形成不同间距的问题,可将若干个物体在某一时刻的排列情形等效成一个物体在不同时刻的位置,这就类似于研究匀变速直线运动时打点计时器打下的纸带上的点,由此可以用Δx=aT2、初速度为零的匀变速直线运动的比例关系或者平均速度法进行求解。

2(2024·贵州六盘水市高一期中)如图所示是一小球做自由落体运动过程中某段时间内的频闪照片,得到小球在运动过程中4次曝光的位置。第1次曝光至第2次曝光,小球下落12 cm;第3次曝光至第4次曝光,小球下落15.2 cm。不计空气阻力,重力加速度g取10 m/s2,根据图中的信息,求:

(1)相邻两次曝光时间间隔T

(2)小球在位置3的速度v3的大小;

(3)小球下落的初始位置与位置4之间的距离H

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二、杆过窗问题

3(2024·上海市浦东新区高一期中)如图所示,有一根长L1=0.5 m的木棍,悬挂在某房顶上,木棍的上端与窗台上沿的竖直距离h=4.55 m,窗口高为L2=1.5 m。某时刻木棍脱落,不计空气阻力,g取10 m/s2。求:

(1)从脱落开始计时,木棍下端到达窗口上沿所用的时间;

(2)木棍通过窗口所用的时间。

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落杆类问题

由于物体有一定的长度,故物体经过某一点不是一个瞬间,而是一段时间,解决这类问题的关键是选准研究过程,找准与这段研究过程的起点和终点相对应的位移,解答过程中应借助示意图,搞清楚物体运动的过程,从而达到解决问题的目的。

三、自由落体多过程问题

4(2024·合肥市高一期中)某跳伞运动员做低空跳伞表演,他离开飞机后先做自由落体运动,t1=4 s后打开降落伞,伞张开后该运动员向下做匀减速直线运动,再经过t2=7 s到达地面时的速度大小为5 m/s,重力加速度g取10 m/s2,求:

(1)伞张开前瞬间,运动员的速度大小;

(2)伞张开后,运动员的加速度大小;

(3)运动员离开飞机时距离地面的高度。

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分析多过程问题的方法:

1.画出运动的示意图,明确题目中的各个过程。

2.多过程中交接处的速度往往起到承上启下的作用,是解题的关键。

答案精析

1 (1)0.2 s (2)3.2 m

解析方法一公式法

1)设屋檐离地面高为h,滴水时间间隔为T。如图所示。

由公式h=gt2

2滴雨滴下落的位移

h2=g3T2

3滴雨滴下落的位移

通过网盘分享的文件:word讲义等2个文件

链接: https://pan.baidu.com/s/10u4A4UHo4nIo8baxixnEvg?pwd=4321 提取码: 4321 

--来自百度网盘超级会员v8的分享

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  1. CONNECT:[ UseTime:0.001027s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001650s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000673s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.020949s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001683s ]
  6. SELECT * FROM `set` [ RunTime:0.000539s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001467s ]
  8. SELECT * FROM `article` WHERE `id` = 473161 LIMIT 1 [ RunTime:0.002091s ]
  9. UPDATE `article` SET `lasttime` = 1773097651 WHERE `id` = 473161 [ RunTime:0.018704s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.006880s ]
  11. SELECT * FROM `article` WHERE `id` < 473161 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.010921s ]
  12. SELECT * FROM `article` WHERE `id` > 473161 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.003034s ]
  13. SELECT * FROM `article` WHERE `id` < 473161 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002246s ]
  14. SELECT * FROM `article` WHERE `id` < 473161 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.001712s ]
  15. SELECT * FROM `article` WHERE `id` < 473161 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.004045s ]
0.244507s