Sep 2016
03-뉴튼의 사과
26/09/16 18:13
Chap. 3 뉴튼의 사과
May the Force Be with You
“The F, the m and the a in Newton’s formula are very important concepts in mechanics. The F is force, a push or pull exerted on an object. The m is mass, a measure of how much matter is in an object. And the a is acceleration, which describes how an object’s velocity changes over time. Velocity, which is similar to speed, is the distance an object travels in a certain amount of time.”
-- From http://science.howstuffworks.com/science-vs-myth/everyday-myths/newton-law-of-motion1.htm
Useful Links and Further Reading:
- Newton’s laws of motion (From Wikipedia, the free encyclopedia) - Inside see the MIT Open Courseware (Video Lectures) 6: Newton’s First, Second, and Third Laws: http://en.wikipedia.org/wiki/Newton’s_laws_of_motion
- “Galileo and Einstein” by Michael Fowler (U of Virginia) http://galileoandeinstein.physics.virginia.edu/
- 사과 멀리 날리기 demo: http://galileoandeinstein.physics.virginia.edu/more_stuff/Applets/newt/newtmtn.html
- Speed and Velocity: http://www.physicsclassroom.com/class/1dkin/u1l1d.cfm
- Velocity Vector: http://mathworld.wolfram.com/VelocityVector.html
- Fishing under ice: http://bestofyoutube.com/fishing-under-ice -- Figure out how gravity works here!
- 관성이란 어떻게 생기는 것일까? 관성이 큰 물체와 작은 물체의 차이는 어떻게 생기는 것일까?
- 힘과 가속도의 비례 관계를 어떻게 알 수 있나? 주변에서 뉴튼의 제2법칙을 보이는 경우를 생각해보자.
- 외부에서 힘을 받지 않고 “스스로 움직이는 물체”를 찾아보자. 이런 물체는 뉴튼의 법칙에 위배되는 운동을 하는 것일까?
- 어떤 물체의 상태, 즉, 속도가 변하려면 힘을 받아야 한다. 힘을 주고 받는 방법에 대한 고찰을 해보자.
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02-개미와 고래
20/09/16 19:02
Chap. 2 개미와 고래
We can understand certain phenomena without actually doing the detailed calculations needed for a complete solution. Galileo Galilei first pointed out that similar objects can be related by scaling laws. These laws explain why an elephant cannot look like an enlarged mouse, why a giant human necessarily has certain problems, and why there are ultimate limits to the sizes of animals, plants and structures. This simple idea is called dimensional analysis, one of the physicist’s favorite trick. In this chapter, we will explore its stories and principles behind it.
• 강의록: 02-개미와 고래 (Presentation file: 02-개미와 고래)
Useful Links and Further Reading:
- Galileo’s Square-Cube Law: http://dinosaurtheory.com/scaling.html
- “Of Mice and Elephants: A Matter of Scale” by George Johnson: http://hep.ucsb.edu/courses/ph6b_99/0111299sci-scaling.html
- “The Biology of B-Movie Monsters” by Michael C. LaBarbera: http://fathom.lib.uchicago.edu/2/21701757/
- Kleiber’s law: http://en.wikipedia.org/wiki/Kleiber’s_law
- Google Lecture Series: Scaling Laws In Biology And Other Complex Systems: http://www.youtube.com/watch?v=uEB4p9qbliE
- [YouTube] Hewitt-Drew-it! PHYSICS 55. Scaling 1, https://www.youtube.com/watch?v=DBOkLabPdj8
- [YouTube] Hewitt-Drew-it! PHYSICS 56. Scaling 2, https://www.youtube.com/watch?v=AXEG-IGNoew
- [YouTube] Hewitt-Drew-it! PHYSICS 57. Scaling 3, https://www.youtube.com/watch?v=ZLlRwpn3wgc
Homework Assignment : 9/26 (월) - 강의시간에 제출
- Chap.2 강의와 Reading Assignment에 대한 보고서 제출. (Reference에 주어진 짧은 보고서 양식을 참고)
Suggested Questions
- 가장 효율적인 “왕” 개미의 모습은? 반대로 고래가 개미만하게 작아진다면 어떤 모습으로 변해야 생존할 수 있을까?
- 사람이 피 속의 “적혈구” 크기로 작아진다면 어떤 모양으로 변해야 할까?
- 자전거를 “적혈구” 크기로 작게 만든다면 어떻게 만들어야 할까?
- Suppose that muscular forces scale as the cross-sectional area of the muscles involved. Can we claim that the height of the jump is independent of the animal’s size? In other words, Can a flea can jump as high as a man or vice versa?
- The leg bones of one animal are twice as strong as those of another closely related animal of similar shape. (a) What would you expect to be the ratio of these animals’ heights? (b) What would you expect to be the ratio of their weights?
01-호기심의 과학
06/09/16 22:41
Useful Links and Further Reading:
- Roberto Carlos’s Free Kick (1997) - http://www.youtube.com/embed/Pl0LHM–33Io
- The physics of football - physicsworld.com - http://physicsworld.com/cws/article/print/1533
- Physics of free kicks: The hidden advantage of long-distance soccer shots - http://blogs.scientificamerican.com/observations/2010/09/02/physics-of-free-kicks-the-hidden-advantage-of-long-distance-soccer-shots/
- Robots That Walk on Water - Scientific American - http://www.scientificamerican.com/article.cfm?id=robots-that-walk-on-water
- Water surface tension - http://www.youtube.com/watch?v=u5AxlJSiEEs
- Surface Tension Droplets at 2500fps - https://www.youtube.com/watch?v=ynk4vJa-VaQ
00-미시거시 강의개요
04/09/16 23:14
미시세계와 거시세계 — (2016학년도 2학기)
- 과목 번호: 027.004
- 과목명 및 학점: 미시세계와 거시세계, 3학점
- 담당 교수: 유재준 (56–508, 02-880–8934, jyu@snu.ac.kr)
- 과목 홈페이지: http://phya.snu.ac.kr/jyu/mima–16/
- 담당 조교: 박성우
- 강의실 및 강의시간: 500동 L309호, 월∙수 오후 2:00 - 3:15
◦ Science is a dialogue between nature and mind. The way of science is to connect experience and ideas.
◦ 미시세계와 거시세계: 강의주제All good science is based on observable evidence. Science is always skeptical, always asking, ‘What is the evidence?’, ‘How do we know?’
◦ 강의 설계
◦ 능동학습의 순환구조 만들기
Image link: http://4mat4business.com/blog/tag/4mat-learning-model/
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