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【教学实录和反思】用好一张去年的试卷安排半期复习

  • 2026-04-21 05:12:29
【教学实录和反思】用好一张去年的试卷安排半期复习
摘要
说明:排版时候,公式都被搞掉了,想睡觉了,不再整理了!见谅。
用典型试卷带动全面复习的三大心法按板块重组,而非按题号顺序讲:将试卷拆解为“曲线运动—天体运动—功和功率”三大模块,帮助学生建立知识结构。
概念对比+模型归类:比如将匀速圆周运动(摩天轮)与非匀速圆周运动(竖直圆轨道)放在一起讲,对比异同,提炼通法。
以题带点,由点及面:每道题讲完后立即进行“方法提炼”,如“传动装置:皮带边缘v相等,同轴ω相等”“变轨口诀:低到高需加速”等,让一道题带出一类题。
01曲线运动:从概念辨析到实验方法

第1题:平抛vs圆周,到底谁“匀变速”?

我带着学生重新捋了一遍:
平抛:合力恒为重力→匀变速曲线运动
匀速圆周:合力大小不变、方向始终指向圆心→变加速曲线运动
关键点就一个:看加速度(合力)是否恒定。

第2题:传动装置,记住两句话

主动轮与从动轮边缘线速度相等,同轴转动角速度相等。由就能快速推比例。
方法提炼:皮带传动,v相等;同轴转动,ω相等。

第3题+第7题:竖直面内的两种圆周运动

我把这两道题放在一起对比——
第3题(摩天轮):匀速圆周运动,最高点失重,最低点超重。
第7题(竖直圆轨道):非匀速圆周运动,最高点由重力和轨道压力的合力提供向心力,离开后做平抛。
  • 第7题还涉及一个常见考点:从最高点飞出后,会不会落在圆弧上?
  • 方法:先求平抛水平位移,再与半径比较。

实验题:第11题(向心力演示仪)&第12题(平抛频闪)

第11题:控制变量法,表格数据直接验证。
第12题:频闪照片处理三步走——定周期→求初速→合成某点速度。
板块小结:曲线运动的核心就两条路——平抛(分解)和圆周(向心力来源)。
02天体运动:从计算题反推选择题

第13题(计算题)

我先带着学生做了第13题(计算题),因为它是最基础的“求天体质量和第一宇宙速度”。
自由落体求表面重力加速度
由得
第一宇宙速度
方法提炼:黄金代换,这是处理星球表面问题的万能钥匙。

第6题:赤道物体、近地卫星、同步卫星

这道题很多学生容易混淆。我教他们分两步比较:
1.卫星之间比:,半径越大线速度越小→
2.地面物体与同步卫星比:角速度相同,,半径小则线速度小→
最终:

第5题(双星)&第9题(变轨)

双星问题强调两点:角速度相等、周期相等,半径与质量成反比。
变轨问题一句口诀:低到高需加速,高到低需减速;椭圆近快远慢。
板块小结:天体运动就三句话——万有引力提供向心力、黄金代换、半径决定快慢。
03功和功率:图像与启动问题

第10题:图像

这是试卷的压轴选择题,很多学生一看到图像就慌。
我带着他们一步步拆解:
由得,图像斜率就是功率。
从图中读出斜率→功率
最大速度时→阻力
方法提炼:遇到图像,直接转化为,斜率为。

第14题(平衡车启动)&第15题(管道+传送带)

第14题是典型的恒定加速度启动问题,三个关键点:
  • 匀加速阶段:,功率不断增大
  • 功率达到额定值后,做变加速
  • 最终匀速:
第15题综合性强,我重点讲了思路拆解:
  • 1.从C点平抛到D点,由高度差和平抛时间求C点速度
  • 2.在C点用向心力方程求管道压力
  • 3.传送带上先判断相对运动,再求时间和功
这道题我留作课后完整计算,下节课展示典型解法。
板块小结:功和功率的核心是“谁做功、怎么算”,机车启动要分清“恒a”和“恒P”两个阶段。
写在最后:用一张试卷带起整个复习,我总结了三条经验
这节课下来,虽然没时间把每道题都掰开揉碎地讲,但学生普遍反映“脑子里有框架了”。
如果你也想用类似的思路组织复习,不妨记住这三点:
  • 1.按板块重组题目:别按题号顺序讲,而是按知识模块重新“切”开,让学生看到知识之间的联系。
  • 2.对比+归类:把相似的模型放在一起(比如两种竖直面内的圆周运动),对比异同,效果远大于孤立讲解。
  • 3.每道题后提炼一句话方法:比如“皮带传动v相等”“低到高需加速”“图像斜率是功率”——这些“口诀式”的提炼,学生最容易记住。
半期考试即将到来,与其刷一堆新题,不如把一张高质量的真题吃深、吃透、吃出框架。
希望这篇文章对你有所帮助。如果你也在尝试类似的复习方式,欢迎留言交流。

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  1. CONNECT:[ UseTime:0.000738s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000900s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000344s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000351s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000616s ]
  6. SELECT * FROM `set` [ RunTime:0.000266s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000641s ]
  8. SELECT * FROM `article` WHERE `id` = 481121 LIMIT 1 [ RunTime:0.000405s ]
  9. UPDATE `article` SET `lasttime` = 1776809529 WHERE `id` = 481121 [ RunTime:0.001808s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000348s ]
  11. SELECT * FROM `article` WHERE `id` < 481121 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000514s ]
  12. SELECT * FROM `article` WHERE `id` > 481121 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000567s ]
  13. SELECT * FROM `article` WHERE `id` < 481121 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000630s ]
  14. SELECT * FROM `article` WHERE `id` < 481121 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000662s ]
  15. SELECT * FROM `article` WHERE `id` < 481121 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.002058s ]
0.085891s