英语物理特色作业：端午赛龙舟的物理知识

儿子学校布置的端午节作业要求为——

英语物理特色作业 ：端午来临，你可以观看龙舟比赛或者切身体验，用英文讲解 你观察到的物理小原理或者一些奇思妙想、制胜关键（例如物体间力的作用是相互的，漂浮时浮力和重力的关系，人下船后，船的 V 排变化等等）和自己的收获感悟，以视频方式提交。

切记：如果亲身体验，一定要注意安全，确保安全第一，拍摄视频要横屏拍摄（横 屏，横屏，横屏），期待你的精彩表现。

以下为儿子的作业脚本，恭祝新老朋友们端午安康❤️

注：长期关注本公众号的老朋友，已经很久没有看到我儿子发新的内容了——一方面是初中生的日程紧锣密鼓，另一方面是处于变声期，不太愿意录制音视频😄

[Introduction]

Hello everyone! Today, with the arrival of the Dragon Boat Festival, I'm going to take you through some interesting physics principles behind the exciting dragon boat races. Let's explore how physics plays a crucial role in this traditional sport!

[Section 1: Forces and Their Interactions]

As we watch the dragon boats slice through the water, it's fascinating to see how the paddlers work together in harmony. When they paddle, they are exerting a force on the water. But remember, Newton's third law tells us that for every action, there is an equal and opposite reaction. So, as the paddlers push against the water, the water pushes back with an equal force, propelling the boat forward. This interaction of forces is what drives the boats ahead in the race.

[Section 2: Buoyancy and Gravity]

Another fascinating physics aspect of dragon boat racing is the relationship between buoyancy and gravity. The boats float on the water due to the buoyant force exerted by the fluid on the boat, which is equal to the weight of the fluid displaced by the boat. As long as the buoyant force balances the gravitational force acting on the boat and its occupants, the boat will float. The design of the dragon boat, with its long and narrow hull, helps to reduce drag and optimize buoyancy, allowing for swift movement through the water.

[Section 3: Changes in Displacement]

Have you noticed how the boats seem to rise higher in the water when the paddlers get off? This is because the volume of water displaced by the boat decreases when the weight on the boat is reduced. Archimedes' principle tells us that the buoyant force is equal to the weight of the fluid displaced by the object. So, as the paddlers disembark, the boat rises in the water 、due to the decrease in weight 、and corresponding decrease in water displacement.

[Conclusion and Personal Reflection]

Watching and participating in dragon boat races not only immerses us in a vibrant cultural celebration but also provides a unique opportunity to observe and understand physics principles in action. From the interaction of forces to the balance of buoyancy and gravity, these races are a testament to the harmony of human effort and natural laws.

For me, experiencing the dragon boat race firsthand was an eye-opening lesson in teamwork and physics. It reinforced my understanding that science is not just about textbooks and laboratories, but also about real-world applications that bring people together.