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Tuesday, November 30, 2010

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Mechanism of Ozone Formation and Ultraviolet Absorption

Mechanism of Ozone Formation and Ultraviolet Absorption
Kredit : http://www.youtube.com/user/Hendorr

This video demonstrates how oxygen gas in the atmosphere becomes ozone and how ozone protects us from ultraviolet radiation.


Food Web and Food Chain

Chapter 3 - Form 5

What's Eating You: Producers, Consumer, Decomposers
Kredit : http://www.youtube.com/user/mrsefdubose




Food web: Visualizing and Understanding Interdependence in Nature
Kredit : http://www.youtube.com/user/foodwebhead




Energy Pyramid and Food Web
Kredit : http://www.youtube.com/user/dmickowski





Food Chain and Web
Kredit : http://www.youtube.com/user/EZRenewalCredit



Ecosystem

Chapter 3 - Form 5

What is an Ecosystem?
Kredit : http://www.youtube.com/user/mrsefdubose


Radioactive Isotopes

Chapter 6 -Form 4 : Nuclear Energy

Radioactive Isotopes
Kredit : http://www.youtube.com/user/msnye

Alpha particles, beta particles and gamma rays.
Alpha particles are helium nuclei with a +2 charge, Big, heavy and slow moving, don't penetrate into materials, Very ionising, Blocked by paper.

Beta particles are high-energy electrons with a -1 charge; Quite small, move quite fast, Penetrate materials moderately, Ionise moderately, for every beta particle emitted, a neutron turns into a proton in the nucleus, some are blocked by thin Aluminium, but certainly blocked by tissue.

Gamma rays are electromagnetic waves with shorter wavelength (higher frequency) than x-rays, Opposite to alpha, Penetrate materials well, Weakly ionising, blocked by 7 cm of lead.



Differentiating Alpha, Beta and Gamma Waves

Chapter 6 - Form 4 : Nuclear Energy

Differentiating Alpha, Beta and Gamma Waves
Kredit : http://www.youtube.com/user/Hendorr


Chapter 6 Radioactive (Nuclear reactor)

Chapter 6 -Form 4 : Nuclear Energy

Nuclear Reactor
Kredit : http://www.youtube.com/user/TutorVista


Alpha Beta Gamma Ionizing Radiation

Chapter 6 -Form 4 : Nuclear Energy

Alpha Beta Gamma Ionizing Radiation 1980
Kredit : http://www.youtube.com/user/markdcatlin


The Electromagnetic Spectrum

Chapter 8- Form 5 : Electronics & Information & Communication Technology (ICT)

The Electromagnetic Spectrum
Kredit : http://www.youtube.com/user/sparkleystitch



The Electromagnetic Spectrum Song - by Emerson & Wong
Yann (Singapore)
Kredit : http://www.youtube.com/user/phyisfun



Respiration In Plants

Chapter 3- Form 5 :

Respiration In Plants
Kredit : http://www.youtube.com/user/TutorVista



Nitrogen Cycle, Carbon cycle and Water Cycle

Chapter 3 - Form 5 : Preservation and Conservation of the Environment

Nitrogen Cycle, Carbon cycle and Water Cycle

Nitrogen Cycle 0010
Kredit : http://www.youtube.com/user/Kevinatmiis




Carbon Cycle and Global Warming
Kredit : http://www.youtube.com/user/WydeaWonders

The carbon cycle, the flow of carbon on our planet, is amazingly complex. Here's a quick look at how carbon flows between different areas on our earth and how humans have likely contributed to global warming.





Water cycle
Kredit : http://www.youtube.com/user/musicmadgirl




Water cycle
Kredit : http://www.youtube.com/user/junglistmover




Water cycle
Kredit : http://www.youtube.com/user/susilo297





The Earth's Water Cycle - Environmental Science
Kredit : http://www.youtube.com/user/MITEHippoCampus



Transpiration In Plants

Chapter 3 - Form 5

Transpiration In Plants
Kredit : http://www.youtube.com/user/TutorVista





Transpiration
Kredit : http://www.youtube.com/user/Hortmage



Photosynthesis

Chapter 3 - Form 5

Photosynthesis
Kredit : http://www.youtube.com/user/bozemanbiology




Plants: Photosynthesis
Kredit : http://www.youtube.com/user/britannica

Simple primary, secondary & tertiary color

Chapter 7 - Form 4 : Light, Colour and Sight

Simple primary, secondary & tertiary color
Kredit : http://www.youtube.com/user/fun2cook







Chasing rainbow and the em spectrum
Kredit : http://www.youtube.com/user/mrmacdonald1



Convex Lense and Concave Lense

Chapter 7- Form 4 : Light, Colour and Sight

Formation of Image by a convex Mirror In Ray Diagram

Kredit : http://www.youtube.com/user/TutorVista




Converging lenses a beginners guide for A level
Kredit : http://www.youtube.com/user/fizzicsorg


An explanation of the the basic uses of converging lenses and the drawing of scale diagrams to show how an image is formed.





Determine the focal length of a given convex lens by U-V methods
Kredit : http://www.youtube.com/user/kanha67




Image Formation by a Convex Lens When the Object is at Infinity
Kredit : http://www.youtube.com/user/TutorVista





Image formation by convex lens - Animation by mySSC.in
Kredit : http://www.youtube.com/user/mysscin



Investigating and Concave Mirror

Chapter 7 - Form 4 : Light, Colour and Sight

Investigating and Concave Mirror
Kredit : http://www.youtube.com/user/TutorVista


A convex mirror is a curved mirror in which the reflective surface bulges toward the light source. Convex mirrors reflect light outwards, therefore they are not used to focus light. Such mirrors always form a virtual image, since the focus (F) and the centre of curvature (2F) are both imaginary points "inside" the mirror, which cannot be reached. Therefore images formed by these mirrors cannot be taken on screen. (As they are inside the mirror)

A collimated (parallel) beam of light diverges (spreads out) after reflection from a convex mirror, since the normal to the surface differs with each spot on the mirror.

The image is always virtual (rays haven't actually passed through the image,their extensions do), diminished (smaller), and upright . These features make convex mirrors very useful: everything appears smaller in the mirror, so they cover a wider field of view than a normal plane mirror does as the image is "compressed". has a reflecting surface that bulges inward (away from the incident light). Concave mirrors reflect light inward to one focal point, therefore they are used to focus light. Unlike convex mirrors, concave mirrors show different image types depending on the distance between the object and the mirror.

These mirrors are called "converging" because they tend to collect light that falls on them, refocusing parallel incoming rays toward a focus. This is because the light is reflected at different angles, since the normal to the surface differs with each spot on the mirror.



Dipersion of White Light

Chapter 7 - Form 4 : Light, Colour andSight

Dispersion Of White Light

Kredit : http://www.youtube.com/user/TutorVista

Check us out at http://www.tutorvista.com/


In optics, dispersion is the phenomenon in which the phase velocity of a wave depends on its frequency, or alternatively when the group velocity depends on the frequency. Media having such a property are termed dispersive media. Dispersion is sometimes called chromatic dispersion to emphasize its wavelength-dependent nature, or group-velocity dispersion (GVD) to emphasize the role of the group velocity.
The most familiar example of dispersion is probably a rainbow, in which dispersion causes the spatial separation of a white light into components of different wavelengths (different colors). However, dispersion also has an effect in many other circumstances: for example, GVD causes pulses to spread in optical fibers, degrading signals over long distances; also, a cancellation between group-velocity dispersion and nonlinear effects leads to soliton waves. Dispersion is most often described for light waves, but it may occur for any kind of wave that interacts with a medium or passes through an inhomogeneous geometry (e.g. a waveguide), such as sound waves.
There are generally two sources of dispersion: material dispersion and waveguide dispersion. Material dispersion comes from a frequency-dependent response of a material to waves. For example, material dispersion leads to undesired chromatic aberration in a lens or the separation of colors in a prism. Waveguide dispersion occurs when the speed of a wave in a waveguide (such as an optical fiber) depends on its frequency for geometric reasons, independent of any frequency dependence of the materials from which it is constructed. More generally, "waveguide" dispersion can occur for waves propagating through any inhomogeneous structure (e.g. a photonic crystal), whether or not the waves are confined to some region. In general, both types of dispersion may be present, although they are not strictly additive. Their combination leads to signal degradation in optical fibers for telecommunications, because the varying delay in arrival time between different components of a signal "smears out" the signal in time.

What’s Inside a Car Engine?

Chapter 5 - Form 5 : Motion

What’s Inside a Car Engine?
Kredit : http://www.youtube.com/user/WydeaWonders

Have you ever wondered how your car's engine produces power and pushes you down the road? Discover what really happens under your hood in under a minute!


Inertia

Chapter 5 Form 5 : Motion

Inertia

Kredit : http://www.youtube.com/user/TutorVista


Check us out at http://www.tutorvista.com

Inertia is the resistance of any physical object to a change in its state of motion. It is represented numerically by an object's mass. The principle of inertia is one of the fundamental principles of classical physics which are used to describe the motion of matter and how it is affected by applied forces.

Inertia comes from the Latin word, "iners", meaning idle, or lazy. In common usage, however, people may also use the term "inertia" to refer to an object's "amount of resistance to change in velocity" (which is quantified by its mass), or sometimes to its momentum, depending on the context (e.g. "this object has a lot of inertia"). The term "inertia" is more properly understood as shorthand for "the principle of inertia" as described by Newton in his First Law of Motion. This law, expressed simply, says that an object that is not subject to any net external force moves at a constant velocity. In even simpler terms, inertia means that an object will always continue moving at its current speed and in its current direction until some force causes its speed or direction to change. This would include an object that is not in motion (velocity = zero), which will remain at rest until some force causes it to move.

On the surface of the Earth the nature of inertia is often masked by the effects of friction, which generally tends to decrease the speed of moving objects (often even to the point of rest), and by the acceleration due to gravity. The effects of these two forces misled classical theorists such as Aristotle, who believed that objects would move only as long as force was being applied to them.


Four Stroke and Two Stroke Engine

Chapter 5 - Form 5 : Motion

How a 4 Stroke Engine Works
Kredit : http://www.youtube.com/user/dizzo95


4-stroke engine
Kredit : http://www.youtube.com/user/factfrog




2- stroke engine
Kredit : http://www.youtube.com/user/factfrog


Endocrine System and Hormones

Chapter 2 - Form 4 : Body Coordination

Endocrine System and Hormones
Kredit : http://www.youtube.com/user/bozemanbiology


Pascal's Law and Hydraulic Brake System

Chapter 5 - form 5 : Motion

Pascal's Law and Hydraulic Brake System

Kredit : http://www.youtube.com/user/TutorVista

Check us out at http://www.tutorvista.com

Pascal's law or Pascal's principle states that "pressure exerted anywhere in a confined fluid is transmitted equally in all directions throughout the fluid."

The hydraulic brake is an arrangement of braking mechanism which uses brake fluid, typically containing ethylene glycol, to transfer pressure from the controlling unit, which is usually near the operator of the vehicle, to the actual brake mechanism, which is usually at or near the wheel of the vehicle.

The most common arrangement of hydraulic brakes for passenger vehicles, motorcycles, scooters, and mopeds, consists of the following:
•A brake pedal or lever
•A pushrod, also called an actuating rod
•A master cylinder assembly containing:

A piston assembly made up of:
Either one or two pistons
-A return spring
- A series of gaskets/ O-rings
- A fluid reservoir
- Reinforced hydraulic lines
-A brake caliper assembly usually containing:
oOne or two hollow aluminum or chrome-plated steel pistons called caliper pistons
oA set of thermally conductive brake pads
-A rotor (also called a brake disc) or a drum attached to a wheel
A glycol-ether based brake fluid usually fills the system (other fluids may also be used) and manages the transfer of force/ energy between the brake lever and the wheel.

At one time, passenger vehicles commonly employed disc brakes on the front wheels and drum brakes on the rear wheels. However, because disc brakes have been shown a better stopping performance and are therefore generally safer and more effective than drum brakes, four-wheel disc brakes have become increasingly popular, replacing drums on all but the most basic vehicles. Many two-wheel vehicles designs, however, continue to employ a drum brake for the rear wheel


Mitosis and Meiosis

Chapter 3- Form 4 : Heredity and Variation

Sila klik Diagnostik Test untuk muat turun Ujian Diagnostik untuk bab ini.


Mitosis
Kredit : http://www.youtube.com/user/bozemanbiology

Chapter 8a podcast on mitosis and cell division.




Mitosis
Kredit : http://www.youtube.com/user/ppornelubio






Meiosis
Kredit : http://www.youtube.com/user/ppornelubio





Meiosis
Kredit : http://www.youtube.com/user/bozemanbiology

Chapter 8b podcast on meiosis.





Mitosis and Meiosis Simulation
Kredit : http://www.youtube.com/user/bozemanbiology



Cell Division

Chapter 3- Form 4 : Heredity and Variation

Credit : Scribd

Cell Division science form 4
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