# M22 물리 Physics EE (Grade A)

본 문서는 May 2022년도에 제출했던 물리 Extended Essay입니다. Predicted으로는 B를 받았으나 IB 심사위원들이 평가한 final 점수는 A를 받았습니다.

주제는 고난이도의 지식과 매우 정확한 실험을 필요로 하여 물리 EE에서 흔하게 찾아볼수 없는 fluid dynamics에 대하여 썼고 research question은 “How do changes in viscosity of fluid affect the speed and amplitude of surface waves that are generated by an impact of spherical object?” 입니다.

물리 EE에서는 본래 있던 식을 자신의 research question에 맞게 변형하여 자신만의 고유한 식을 만들어 내는게 중요하다고 생각합니다. 본 문서에 그 과정이 자세하게 풀이 되어있고 실험 방식, 결과, 거기서 얻어낸 결론, 그리고 conclusion 등이 빠짐없이 잘 설명되어 있습니다. 또한, Microsoft Word로 작성 하였기 때문에 format과 formula들이 깔끔하게 정렬되있어 쉽고 편하게 읽으실 수 있습니다.

물리 EE 주제를 고르는것을 어려워 하는 학생, 혹은 EE를 어떻게 풀어나가야 고득점을 노릴 수 있는지 감이 오지 않는 학생들에게 추천합니다.

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[본문내용]

IB Physics Extended Essay

## Relationship between the viscosity of the fluids and their surface waves

#### “How do changes in viscosity of fluid affect the speed and amplitude of surface waves that are generated by an impact of spherical object?”

1. Introduction

Fluid mechanics, a branch of engineering that describes the behavior of fluid (gas and liquid), is one of the most important and interesting branches of engineering and well known for its complexity due to the randomness of fluid’s motion; “it is a branch of classical physics with applications of great importance in hydraulic and aeronautical engineering, chemical engineering, meteorology, and zoology” (Faber, 2019). Adding on, the flower of fluid mechanics, Navier-Stokes Equations, a partial differential equation that describes the motion or flow of the fluid, is one of the Millennium Problems as it has not yet been proven whether the equation always has a smooth solution in 3 dimensions. This is one of the main reasons that motivated me to select physics as my extended essay subject and investigate fluid dynamics in particular.
The interest in viscosity of a fluid has existed in my mind since I was young. Whenever my throat sored, I loved mixing honey with hot milk to make a “honey milk,” as my grandmother called it. When I poured honey into the hot milk, I always got annoyed by how slow the honey flowed into the hot milk from the plastic bottle. This experience allowed me to question myself, “why does honey take so much more time to flow than water?” I have forgotten about this question until I watched a video about viscosity on YouTube about a year ago. The video reminded me of the question that I came up with when I was very young, which motivated me to conduct research regarding viscosity of a fluid in this extended essay. After doing research on viscosity by watching various videos regarding viscosity, I could find out that more force is required to move more viscous fluid. I then eventually became curious about the correlation between fluid’s viscosity and the wave’s characteristics as I really enjoyed learning topic 4 and topic 9 of IB physics, which is all about waves. The interest in wave and viscosity allowed me to combine two different topics to develop a unique and intriguing research question. Therefore, in this extended essay, I will be focusing on answering the following question: How do changes in viscosity of fluid affect the speed and amplitude of surface waves that are generated by an impact of spherical object?

• 총 페이지수: 32 pages
• 과목명: Extended Essay (Physics)
• 주제: How do changes in viscosity of fluid affect the speed and amplitude of surface waves that are generated by an impact of spherical object?
• The file is in PDF format.

### M22 물리 Physics EE (Grade A)

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