当前位置:首页>考研真题>再分析一道二中期中考试真题,你选择v-t图求解还是转换参考系求解?——深挖规律练透思维|高考|强基|物理好题深度拆解003

再分析一道二中期中考试真题,你选择v-t图求解还是转换参考系求解?——深挖规律练透思维|高考|强基|物理好题深度拆解003

  • 2026-05-18 10:12:59
再分析一道二中期中考试真题,你选择v-t图求解还是转换参考系求解?——深挖规律练透思维|高考|强基|物理好题深度拆解003

大家好,我是大瓜。

今天继续在本合集大瓜物理・从审题到满分:一题五步法解析,带大家吃透一道道思维质量极高的物理好题。

今天这道题目是石家庄二中高二年级期中考试物理试卷中的一道单选真题,在考场上你用的是最优解题方法吗?解对了吗?用了多长时间?快跟着本文一探究竟。

这类题既能锻炼深度物理思维,又贴合高考压轴方向,同时向强基 & 竞赛预赛难度靠拢。

想突破物理高分、冲刺顶尖题型的同学,一定要认真跟着走一遍完整思路。

图像助解 · 草图撬动思维

  • 将复杂问题几何化:这道题如果只用代数法,需要分段列方程,解一个关于时间的二次方程,处理两个不同的时间区间,计算量大且容易出错。而一张精确的 v-t 图像,可以让我们从“计算”中解放出来,进入“看图说话”的模式。

  • 结论:利用 v-t 图像,我们可以快速、直观地判断出相遇两次,并求出第二次相遇的确切时刻和位移,这正是解这类选择题压轴题的核心技巧。

竞赛反思 · 高阶降维打击

  • v-t 图像法 vs 相对运动法

    • 首选 v-t 图像法
      :对于本题这种多过程、多物体的追及问题,v-t 图像法是普适性最强、最直观、最不容易出错的解法。它能让你对整个运动过程一览无余,是所有方法的基石。
    • 相对运动法的局限性
      :虽然以乙为参考系可以将甲的复杂运动转化为相对运动,但由于甲车加速度在中间时刻发生突变,在变换参考系后,我们仍需要分段处理“甲相对乙”的加速度,并且需要不断回到地面系去判断甲车速度的临界点(如何时减速、何时停止)。这使得相对运动法不仅没有简化问题,反而增加了分析负担。
  • 总结:多过程追及问题的解题策略

    • 对于多物体、多过程的直线运动追及问题,应首先利用情景图和 v-t 图像进行宏观分析,这是最稳妥、最高效的“通法”。
    • 对于单过程(加速度恒定)的追及、避碰问题,可以优先考虑转换参考系的方法,利用相对初速度和相对加速度直接求解,使问题大大简化。
  • 本质理解:本题不仅考查了运动学知识,更考查了考生在面对复杂问题时,选择最优分析工具的能力。是一道典型的“方法选择”题。能立刻想到用 v-t 图像的考生,往往能最快、最准确地锁定答案。

这道压轴选择题的精髓,在于如何从非常规的图像(v2v2x和 x/ttxt)中,提取有效信息,转化为我们熟悉的 v-t 图像,再利用图像的面积和几何关系秒杀追及问题。它完美诠释了“模型转化”和“图解物理”的威力。


📌 本文收录于:大瓜物理・从审题到满分:一题五步法解析本合集只收录:

锻炼深度思维 | 贴合高考压轴 | 接轨强基竞赛的高质量好题。

👉 关注「大瓜物理」本文最底部领取本文可打印PDF版文档。


📚 更多干货

大瓜物理・从审题到满分:一题五步法解析

高中物理一轮复习讲义|高中物理速通


最后,请记住这个核心能力面对任何复杂的运动学问题,都不要急着列方程。先尝试画图——画出情景图,画出 v-t 图。当运动过程在图中被清晰呈现时,答案往往就藏在那些线段和面积里。


📥 获取完整可打印PDF学案:(复制下面链接在浏览器中打开即可)

【金山文档 | WPS云文档】 物理好题深度拆解004_01  https://www.kdocs.cn/l/cjCUDpPWXNA8


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  1. CONNECT:[ UseTime:0.001155s ] mysql:host=127.0.0.1;port=3306;dbname=www_sjds;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001762s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000812s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000636s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001340s ]
  6. SELECT * FROM `set` [ RunTime:0.000633s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001518s ]
  8. SELECT * FROM `article` WHERE `id` = 494131 LIMIT 1 [ RunTime:0.001032s ]
  9. UPDATE `article` SET `lasttime` = 1779086037 WHERE `id` = 494131 [ RunTime:0.029942s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.001591s ]
  11. SELECT * FROM `article` WHERE `id` < 494131 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001307s ]
  12. SELECT * FROM `article` WHERE `id` > 494131 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001166s ]
  13. SELECT * FROM `article` WHERE `id` < 494131 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001864s ]
  14. SELECT * FROM `article` WHERE `id` < 494131 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.003079s ]
  15. SELECT * FROM `article` WHERE `id` < 494131 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.003530s ]
0.222207s