PHYSICS

Blogger's note: The information I will be posting today aren't mine. They were all taken during our discussion in our Advanced Physics II class with Mr. Mohamad Ali Ramber. The pictures and animations aren't also mine. Credits to the rightful owners who placed it in google.

INDEX OF REFRACTION

Refraction is the bending of light.

• Light decreases speed as it enters water
• Light bends when it enters a region of different density.
• The two situations above are under the "optical density"

Formula of Index of Refraction: n = c/v where n= index of refraction, c=speed of light in vacuum (3.0x10⁸ m/s), v = speed of light in the medium

Indices of Refraction

1. Vacuum - 1.0000
2. Air - 1.0003
3. Water - 1.33
4. ethyl Alcohol - 1.36
5. Glass (fused quartz)  - 1.46
6. Crown Glass - 1.52
7. Light flint - 1.58
8. Flexiglass - 1.51
9. Sodium chloride - 1.53
10. Diamond - 2.42

Note that the index of refraction is NEVER less than the value of 1.

REFRACTION: SNELL'S LAW

• Light speed decreases if it travels from a region with lower than 1.0 index of refraction to a higher index of refraction.

Willebrord Snell in 1621

If n₂ < n₁, then θ₂ > θ₁ the ray then BENDS AWAY from the normal line.

Law of refraction: The incident and refracted rays lie in the same plane.

JUST FOR EMERGENCY AND FOR REMINDER IN CASE ANOTHER TEST LIKE THIS WILL BE GIVEN:

RESEARCH

PROBLEM PRESENTATION

After days of researching different data and informations about our THREE chosen problems, we have finally arrived to the day where we had to present to the whole class these three. From the previous blog, I've already talked about our three possible SIP project. And now, we have already made the TITLE for these three possibilities:

1. GARLIC-CHILI-ONION SPRAY AS ALL PURPOSE NATURAL GARDEN PESTICIDE
2. IMPROVISED REMOTE CONTROLLED FLOOR MOP

3. KARTON BOX AS EFFECTIVE COMPONENT FOR RECYCLED PAPER BAGS

We presented in each title the background of the study.  For the background of each study, please go to the ff links:

http://www.slideshare.net/ronnachristmaenglisa/research-37609059
http://www.slideshare.net/ronnachristmaenglisa/3pp-37609061
http://www.slideshare.net/ronnachristmaenglisa/2-research

However, the problem number one got rejected because according to Sir Al, garlic right now is too expensive thus it becomes impractical. Honestly, we wanted to pursue that problem but seeing the disadvantage, we accepted it being rejected so we were left with problems number 2 and 3.

During voting, they all raised for problem number 3 which is unexpected because truth to be told, problem number 3 was more likely "for the sake" only. For the sake of having three problems and we never expected to have people root for it.

However, Sir told us that the decision is still ours. I find the third problem too simple for my liking because it is just simply making paper bag out of kartons. So my teammates and I decided that we pursue problem number two...

Improvised Remote Controlled Floor Mop.

Good luck to us

xoxo
-Ronna

PHYSICS

Blogger's note: The information I will be posting today aren't mine. They were all taken during our discussion in our Advanced Physics II class with Mr. Mohamad Ali Ramber. The pictures and animations aren't also mine. Credits to the rightful owners who placed it in google.

II. CONVEX MIRRORS

Note: Image is always smaller in a convex mirror.

Image formation:

Most of the time, convex mirrors form a reduced, upright and virtual image.

PHYSICS

Blogger's note: The information I will be posting today aren't mine. They were all taken during our discussion in our Advanced Physics II class with Mr. Mohamad Ali Ramber. The pictures and animations aren't also mine. Credits to the rightful owners who placed it in google.

SPHERICAL MIRRORS (CURVED MIRRORS)

I. CONCAVE MIRRORS

where: C - center of curvature, O - object, F- principal focus, f - focal length, v- vertex

Note: If the incident ray is parallel, reflected ray passes through F. If it passes F, reflected ray is parallel. And if it passes C, the reflected ray is still at C.

Defining an image: Is it real or virtual? Where is it located? Is it reduced or enlarged? Is it inverted or upright?

You can identify whether the image is reduced or larged by simply looking at the ray diagram. In the second picture, you can see that the image formed, labeled 'I', is larger than the object 'O' thus the "enlarged" in the definition.

PHYSICS

Blogger's note: The information I will be posting today aren't mine. They were all taken during our discussion in our Advanced Physics II class with Mr. Mohamad Ali Ramber. The pictures and animations aren't also mine. Credits to the rightful owners who placed it in google.

"Mirror, mirror on the wall, who is the fairest of them all?"

Where did the queen in the story Snow White say this? To the mirror.

When you want to check if you still look presentable, where do you look? Of course on the mirror or anything that will reflect your image.

Everyday day in our everyday lives, we always use MIRRORS. Although mirrors are not only used solely for seeing your own reflection, facing the mirror to see our own self is one of the most common practical uses of mirror in which almost everyone in this world does.

REFLECTION AND IMAGE FORMATION

There are different kinds of mirror. Some of these examples are the flat or plane mirror, concave mirror and convex mirror.

The Law of Reflection

• The angle of incidence is equal to the angle of reflection: θ_i  = θ_r
  
• the incident and reflected lines lie in the same plane with the normal line to the surface

Animation: http://64.19.142.13/www.physicsclassroom.com/mmedia/optics/lr.gif

Types of Reflection

1. Regular reflection - reflection on smooth surface

2. Dispersed/Scattered Reflection - reflection on rough surfaces

Characteristics of images formed in mirror:

• laterally reversed
• virtual image (as if the image is found behind the mirror; cannot be projected on screen)
• The same size and distance with the real image

Image Formation

RESEARCH PROPOSALS

Who would've thought things would go this fast and even before our first week in school ended, we would have a new set of projects? After two months of vacation, finally RESEARCH we meet again.

Currently, we were assigned to give three Science Investigatory Project proposals this week. Of course, I cannot do this project alone so I was teamed with some of my classmates. They were Annamea Conol and Kirsteen Villa. After some moments of "brainstorming", we came up with these proposals:

• Creating paper bags out of used carton boxes
• Since carton boxes have some similarities to regular paper, we decided to make it as an alternative substance or "ingredient" in making paper bags. Paper bags are widely used as containers for purchased materials in stores or food chains, next to plastic. On the bright side, it is environmental considering that it is biodegradable. However, it still uses trees the same way as paper does. So we came up with this topic to research a way on how to make paper bags from used carton boxes in order to make a new kind of paper bag which is recycled but has almost the same qualities than that of a regular paper bag, making it more environmental.
•  Garlic and chilli as organic insecticides
• Since we already had research in our third year subjects, we have already read a lot of references and fortunately, one of us came with this certain  article in the internet in which a certain person recommended to use garlic and chilli as insecticide. We are aiming to know the efficiency and effectiveness of this kind of insecticide at the same time, maybe study its phytochemical characteristics in order to know what certain substances are present in these spices that makes it possible for it to be an organic insecticide.
• Improvised remote control mop
• We already had this as our research proposal last year and we decided to have this as our third problem since we already had gathered facts and backgrounds plus the possible methodologies of this proposal. There are already different models of remote controlled mop in the online market already however, some people cannot afford its price. My previous group in Research I decided to make an improvised remote controlled mop that would be made out of used RC cars instead of making an actual remote control mop. Here's the prototype:

 

Prototype source: www.evilmadscientist.com

 We are still working on deciding which of these three we will pursue but we are doing our best. This week, we will present our short proposals about these three.

Fighting~

-Myeonna <3

Ready...

One week has passed since our life as senior students started. One week of new knowledge, review topics, exams... One week of resuming my life as a high school student. Life in high school has been really fun. However, I'm nearing to say goodbye to my four years of journey in this life full of tweetums.

It's sad though. My schoolmates and I have been through a lot and it's hard to be separated to people I was always with, almost everyday for the last four years of my life. It's also hard to say goodbye to the school we're I've met a lot of people that left huge footprints in my life.

10 months left... And the clock is ticking.


I'M READY FOR MY ROLLER COASTER RIDE THIS YEAR

-Myeonna <3 

THE TRUTH PLEASE...

Tbh, it's hard for me. I don't know the truth. In fact, I have no idea. Those fan accounts... Those updates... Yes, they shed some light on my confusions but they are not really helping. Not at all. I cannot tell what is the real story. How they really feel. How much does this issue matter to them.

Some people are kinda disappointed to the 11 boys because as what they can see on their videos and previews, they act like nothing's happened. They would even film Happy Camp as OT11 and broadcast Exo Showtime Season 2 (allegedly) as OT11 too. However, I can't afford to be disappointed to them. Why? What I see might be the truth or just a mask or just part of the truth. I'll never know how they act and feel behind cam. The truth will always be the story behind the camera. And I cannot see the 11 other EXO members or Kris behind the camera. I can only see them when they are in front of the camera, talking to the people, performing... I can only see their actions when there's a camera watching them. But I can't see how they act and feel behind those cameras. If only I could, then maybe I would've known the truth.

I miss Kris. I miss Wu Yifan. I miss the OT12. I miss those times when the boys were always together, acting crazy, being idiots.... The idiots I've loved. I'm always praying for those to happen again.

Wu Yifan? Where are you? Are you okay? Are you alone? I'm so worried. Why did you disappear without a word? Did you really file a lawsuit? Are you gonna be okay? Have you been talking with your sons? Will you come back and light our galaxy again?

Suho? Chanyeol? Baek? Sehun? D.O? Kai? Xiumin? Tao? Lay? Luhan? Chen? Are you guys okay? How did you really feel about Yifan disappearing? Are you sad? Were you disappointed? Were you angry? Are you still angry? Do you miss him? :< Did you talk?

I want to ask them a lot of questions. But I can't. we're not only thousands of miles away but we're also two different worlds.

I cannot judge the 12 of them. I cannot jump into conclusions. Because in the first place, I know nothing. Only they know the truth. And as their fan, even if I don't know the truth, I'll just be here. Not judging or concluding but simply continuing to support them, pray for them and love them.

-Myeonna

THE START

Things are now quite different. Considering that we are already the seniors in our school. To be honest, I kinda missed the batch of PagSci students who just graduated last school year. The atmosphere this school year is a bit awkward compared to the previous. Probably because the batch I'm in and our seniors were really close. Try to think of being always together for three years since we were the first two pioneering batches of our school.

The room I'm in now was also the same room I went to when I was still in second year. Since our sophomores are really great in number, they have to be moved to the classrooms that ONCE belonged to the seniors since those were more spacious. So bottom line, the classrooms of the sophomores last school year are now already the classrooms of the seniors, which would be our batch, this school year. Back to barracks.

It's still our fourth day since the first day of classes started but it all seemed like forever. Never thought things could be this hectic and haggard. Research proposals should be presented next week, research test product this July plus the division-wide debate tournament. And to complete the set, here comes my community project and PYLP follow-on, UPCAT, periodical exams and research oral defense on August.

Currently, I'm working on my community project which would involve the donations of used notebooks from those kind-hearted people. Praying for this to be a success

xoxo
Myeonna <3