Rate of reaction - Enzyme Investigation

Biology_Andhyni Tombe

Basic understanding about biological molecules are important to start the Biology lesson in grade  11. Students explore all types of biological molecules such as carbohydrate; lipid; and protein. Students explore the different types of functioning protein, one of it is enzyme. Beside understanding the theory about enzyme, students explore hand on activity by investigating the rate of enzyme reaction.

Chemistry Olympiad University of Indonesia

Dea sukrisna
Chemistry Teacher

Students of high school SVP were joining Chemistry olympiad in conducted by university of Indonesia on last Saturday November 21.

There are from grade 11, Marco Barnas, Aget Aviano, Kenny, and Marcel and also from grade 10, Miky and Hafidz.

"This is one of the way the school encourage the soul to compete" Ms. Andhiny as science teacher coordinator said.

The total participants are more than 800 students from all provinces in Indoensia. 

"This competition give me more opportunity to know the world out side the school. I met student from Bulu Kumba, He is a very enthusiastic student. He motivated me to having more spirit in learning."Aget Said.

"I feel dissapoint because we cannot win this competition. Eventhough we have to stop in the big 150, but we get a lots of experiences" Kenny said.

Light

Grade 8 Atlantic                                                                                        Teacher : Ibu Nuri Martini

L I G H T

You can see an object only if LIGHT from it enters your EYES. Some objects such as the Sun, Electric Lamps and Candles make their own light. We call these LUMINOUS sources. Most things you see do not make their own light but reflect it from a luminous source. They are NON - LUMINOUS objects. 

SHADOWS

Shadows are formed for two reasons. First, because some objects which are said to be Opaque, do not allow light to pass through them. Second, because light travels in straight lines.

SPEED OF LIGHT 
Proof that light travels very much faster than sound is provided by a THUNDERSTORM. The flash of lighting is seen before the thunder is heard. The speed of light has a definite value.

LAW OF REFLECTION 
The law of reflection states:

1.  The incident ray, the reflected ray and the normal all lie in the same plane. (This means that they can all be drawn on a flat sheet of paper)
2. The angle of incidence equals the angle of reflection 

PLANE MIRRORS 
When you look into a plane mirror on the wall of a room you see an image of the room behind the mirror, it is as if there were another room. The position of the image formed by a mirror depends on the position of the object.
A Real image is one which can be produced on a screen and is formed by rays that actually pass through it.
A Virtual image cannot be formed on a screen and is produced by rays which seem to come from it but do not pass through it.
The image in a plane mirror is :

• as far behind the mirror as the object is in front and the line joining the object and image is perpendicular to the mirror,
• the same size as the object, 
• virtual, 
• laterally inverted

LENSES 
Lenses are used in optical instruments such as cameras, spectacles, microscopes and telescopes; they often have spherical surfaces and there are two types,

1. A Converging (or convex) lens is thickest in the center and bends light inwards. 
2. A Diverging (or concave) lens is thinnest in the center and spreads light out. It always gives a diminished image 

PRACTICAL WORK 

Practical work : Images formed by a converging lens

Practical work : Images formed by a conerging lens

Practical Work : Images formed by a converging lens

Sound

Grade 8 Atlantic                                                                           Teacher : Ibu Nuri Martini

SOUND

Sources of sound all have some part which vibrates. A guitar has strings, a drum has a stretched skin and the human voice has vocal cords.
The sound travels through the air to our ears and we hear it. Evidently soound cannot travel in a vacuum as light can. Other materials, including solids and liquids, transmit sound.

Sound waves are reflected well from hard, flat surfaces such as walls or cliffs and obey the same laws of reflection as light. The reflected sounds forms an echo.
The speed of sound depends on the matrial through which it is passing. It is greater in solids than in liquids or gases because the molecules in a solid are closer together than in a liquid or a gas.
In the air the speed increases with temperature and at high altitudes, where the temperature is lower, it is less than at sea-level.

Biology-Transport across Cell membranes

Students were asked to create a video to represent 4 different types of transport. Diffusion, Osmosis, Active Transport, Endocytosis and Exocytosis. Here are two examples of their work.

LHC Hadron collider restarted after two-year upgrade

The world's largest particle smasher has been restarted after a two-year upgrade that will allow physicists to explore uncharted corners of the matter that makes up the universe.

"After two years of intense maintenance and several months of preparation for restart, the Large Hadron Collider, the most powerful particle accelerator in the world, is back in operation," the European Organisation for Nuclear Research (CERN) said.

Experiments at the collider have been seeking to unlock clues as to how the universe came into existence by studying fundamental particles, the building blocks of all matter, and the forces that control them.

The upgrade - which saw the Large Hadron Collider (LHC) shut down in February 2013 - was intended to nearly double the collider's maximum collision capacity.

Its previous highest power was eight teraelectronvolts (TeV) reached in 2012, but after the two-year overhaul, it will first reach 13 TeV and can potentially be cranked up to a maximum 14 TeV.

CERN said earlier that if all went well with the start-up particle collisions "at an energy of 13 TeV" could start as early as June.

Dark matter

During the next phase of the LHC programme, researchers will probe a conceptual frontier called new physics, including antimatter and dark matter.

Dark matter is thought to make up some 96 percent of the stuff of the universe while being totally invisible, and super-symmetry, or SUSY, is under which all visible particles have unseen counterparts.

"If I had to bet on what we will find, I would go for SUSY," said Oliver Buchmueller, a scientist on one of the four machines around the ring that records each collision. "But we could also find something very, very unexpected," he added.

"This is what makes life on the energy frontier so exciting."

The latter is a theoretical type of matter that cannot be seen with telescopes but is thought to make up most of the universe.

Ordinary, visible matter comprises only about four percent of the known universe.

In 2012, the LHC was used to prove the existence of Higgs Boson, the particle that confers mass, earning the 2013 Nobel prize for two of the scientists who, back in 1964, had theorised the existence of the "God particle"

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Individual Research Project - 2015

These pics some activities of students in class during Physics studying or experiment in Laboratory. Individual Research Project for Grade 12. And any activities of teachers at hall for Education Training.

Zaky experiment about another source of energy (IRP = Individual Research Project)

Zaky demonstrate of his experiment Crystal Piezo Electric

Abdul Hakeem's project about Statistic Manipulations in Math

Students Grade 11 Science preparing -self studies- Mechanics Quiz (candid..)

Secondary teachers at Teacher's Room 3rd floor

Learning activity National Exam practice, physics subject.

Learning activity National Exam practice, physics subject.

Learning activity National Exam practice, physics subject.

Secondary teachers at Teacher's Room 3rd floor

Secondary teachers at Amarta Hall with Pak Hendri (principal)

Learning activity National Exam practice, physics subject.

Learning activity National Exam practice, physics subject.

Chelsea show her project about tooth pasta, most using in Indonesia.

All secondary student practice, preparing Charity Concert at Amarta Hall.

Graciella showing the her practice "Air Track" in Laboratory.

Secondary teachers at Amarta Hall, at Education Training.

Some of secondary teachers at Teacher's Room.

Air Track for Collisions trials.

Wave

Grade 8 Atlantic                                                                              Teacher  : Ibu Nuri Martini


WAVE

INTRODUCTION 

A wave is move up of periodic motion. Periodic motion is motion repeated at regular interval. An Oscillation or a Vibration is known as one such complete motion - from one extreme position to the another extreme position and back - 
We will use the terms oscillation and vibration to describe periodic motion.

Before we learn about Wave, we do some experiments of oscillation/vibration.
Experiment #1
Aim : Understanding Definition Period and Frequency of vibration
Activity
Students taking data of number of vibration with variety mass of load (3 different type of load)

 

From this experiments, students learn that : 

• Period (T) is the time taken for one complete vibration 
• Frequency (f) is the number of complete vibrations per seconds 
• Mass doesnt affected to period and frequency of vibration 
• The length of rope and Amplitude doesnt affected to period and frequency of vibration too

Pressure

Grade 8 Atlantic                                                                                          Teacher : Ibu Nuri Martini
Concepts of PRESSURE 

PRESSURE ON SOLID 
Why would a lady in high heels standing on your foot hurt more than an elephant standing on your foot? 
The elephant has a larger weight than the lady, but the contact area between its feet and the foot is far larger. A Force spread over a large area produced a lower pressure.


The relationship between FORCE and AREAS on which the force acting on it is called PRESSURE


PRESSURE ON LIQUIDS

Liquid can produce Pressure. How? Take one plastic bag and fill it with water until it is full. Then make a hole in the side of the plastic. What will happen? Water will spout out from the plastic bag, why? because of the water pressure applied on the hole. 

Properties of Pressure on Liquid 

• Pressure on Liquid depends on a GRAVITYSea-divers feel the water pressure on their bodies from every direction. The deeper they   dive, the bigger the pressure they receive. Consequently, when we dive deeper, our ear will feel hurt, because every water molecule is attracted downward by the Earty's gravitational force. Attracted downward because of gravitation acceleration (Percepatan Gravitasi)  

• Pressure on Liquid depends on the DEPTHThe pressure becomes greater when it goes deeper. As a result, the water spouts reach a longer distance.
  Students do some experiment for prove this properties.

• Pressure on Liquid depends on the DENSITY of the LiquidIf different kinds of liquid are poured into a communicating vessel, do you think that the pressure will still be the same? 
  Remember : 
  Pressure is caused by gravity or the weight of the liquid. 
  Weight of an object is the product of the mass of that object and the gravity in which the object is located. 
  W = m * g 
  Mass of a substance is defines by its density

From properties above, it can be concluded that :
"Pressure on a liquid depend on its DEPTH, GRAVITY and DENSITY but doesnt depend on shape of its container". This statement is known as the main law of Hydrostatics

ARCHIMEDES' LAW 
Have you ever experienced the following phenomenon?

• After swimming when you wanted to go out from the swimming pool, you felt that your body was heavier than before
• It is felt that lifting a weight in the water is lighter than lifting in the air. 

Why is it so?
The volume of the Load immersed in the water is equal to the volume of the displaced liquid. The weight of the displaced liquid is the buoyancy force (GAYA APUNG) 
Archimedes Law says
"Any object, wholly or party immersed in a fluid, is buoyed up by a force equal to the weight of the fluid displaced by the object"
Students do experiment for proving this statement.

 
Why ship or boat can float on the water? 
An Object may float, suspend, or sink when it is in the water. How can it happen? Students do experiment of Archimedes' Law. Here the video when they do experiment