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course:interesting_problems:2025:topic7:start [2024/08/23 14:54] yao-hq 创建 |
course:interesting_problems:2025:topic7:start [2024/09/21 14:00] (当前版本) 白菜大帝 [第一周] |
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* Two rulers are tightly held against each other. A round projectile (e.g. a plastic bottle cap or a ball) is inserted between them close to one of their ends. When extra force is exerted on the surface of the rulers, the projectile is ejected at a high speed. Investigate this effect and the parameters that affect ejection speed. | * Two rulers are tightly held against each other. A round projectile (e.g. a plastic bottle cap or a ball) is inserted between them close to one of their ends. When extra force is exerted on the surface of the rulers, the projectile is ejected at a high speed. Investigate this effect and the parameters that affect ejection speed. | ||
* 两把尺子紧紧靠在一起。将一个圆形射弹(如塑料瓶盖或小球)插入两把尺子之间靠近它们的一端。当在尺子表面施加额外的力时,射弹会以高速射出。研究这一效果以及影响射出速度的参数。 作者:IYPT青年物理学家 https://mp.weixin.qq.com/s/5W6-LwPaFwcg9YD_fvn4nQ 出处:wx | * 两把尺子紧紧靠在一起。将一个圆形射弹(如塑料瓶盖或小球)插入两把尺子之间靠近它们的一端。当在尺子表面施加额外的力时,射弹会以高速射出。研究这一效果以及影响射出速度的参数。 作者:IYPT青年物理学家 https://mp.weixin.qq.com/s/5W6-LwPaFwcg9YD_fvn4nQ 出处:wx | ||
- | * 浅析: | + | * 浅析:紧靠的两把尺子中间塞入瓶盖或小球后发生形变,储存弹性势能,施加外力后使弹丸发生滑动,弹丸所受合力向外,尺子弹性势能释放,将弹丸发射出去。弹射速度将取决于尺子材质与长度,弹丸直径,放置位置等因素。这一发射也可以用两个手指、一双筷子实现。 作者:BNU物理视界 https://www.bilibili.com/read/cv36771220/?jump_opus=1 出处:bilibili |
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====参考文献==== | ====参考文献==== | ||
- | * | + | * https://youtu.be/GdM-nUX6QDQ?si=YAqBzzUgQRlHowPL |
====课题研究记录==== | ====课题研究记录==== | ||
课题研究中可以进行记录的内容: | 课题研究中可以进行记录的内容: | ||
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<tabbox 第二周> | <tabbox 第二周> | ||