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Showing posts with label Physics. Show all posts
Showing posts with label Physics. Show all posts
Thursday, December 25

Physics

Physics (Greek: physis – φύσις meaning "nature") is the Physics (Greek: physis – φύσις meaning "nature") is the natural science which examines basic concepts such as energy, force, and spacetime and all that ...en.wikipedia.org/wiki/Physics - 231k

The Physics Classroom is an online interactive tutorial of basic physics concepts. The lessons use an easy-to-understand language to present common physics ...www.physicsclassroom.com/ - 6k

dir.yahoo.com/Science/Physics/ - 18k - Simpanan sementara - Laman-laman serupa
Eric Weisstein's World of Physics
Online encyclopedia of physics terms and formulas. Full searchable, and also browsable alphabetically and by topic. Part of Eric's Treasure Troves of ...scienceworld.wolfram.com/physics/ - 9k - Simpanan sementara - Laman-laman serupa
Physics 2000
An interactive journey through modern physics. Have fun learning visually and conceptually about 20th century science and high-tech devices.www.colorado.edu/physics/2000/ - 2k - Simpanan sementara - Laman-laman serupa
Physics The WWW Virtual Library
Resources pertaining to the physics of sound, noise control and soundproofing. ... An actively maintained collection of space physics links. ...vlib.org/Physics - 9k - Simpanan sementara - Laman-laman serupa
Physics - spotlighting exceptional research
Let us know what you think of Physics. Please email physics@aps.org with your comments, ideas, or suggestions for topics. You may wish to consult our FAQ ...physics.aps.org/ - 20k - Simpanan sementara - Laman-laman serupa
physicsworld.com
Physics news, jobs, equipment buyer's guide, and events.physicsworld.com/ - 34k - Simpanan
Tuesday, December 16

UNDERSTANDING PHYSICS.

Look outside the window and you may see the leaves of a tree falling down.
There will some students who would not even have noticed the leaves falling. Some may have seen the falling leaves but this not register what they saw. Other may admire the beauty of the falling leaves .
Still others may ask some questions about the falling leaves;
• Why did the leaves fall down and not to fly up ?
• Would the larger leaves fall faster ?
• Would a heavier leaf fall faster?


In fact there are a thousand and one questions you can as about the falling leaves.
The leaves of a tree falling down is one of the events that happened around us everyday
Event –something that happens, in this case the leaves falling from the tree. An action, with a beginning and an end.


Physical phenomena are always unfolding before us. By asking questions we can focus on the aspect we are interested in. By making observations and careful measurements we can gather the necessary data that will help us in our search for the answers to our question. Experiment have to properly planned and carried out to verify the answer we seeks.
In physics we learn about making connections. We know that when released the object,it fall down towards the earth. We observe that the Moon goes round the Earth. Is there any connection between the two phenomena ?


Physics is a branch of science centered on the study of the matter, energy, and the connection between them.ExampleThree students have performed an experiment in which they tested the sinking and floating behavior of three objects , each of the same volume but of difference mass. They found two of the object sank while the third object floated. Consider the following discussion among them.

Q. Why should I have to study physics if I'm going to be a doctor - lawyer - etc?
Physics, as a discipline - especially at an undergraduate level, teaches many things that are important in all walks of life:

1) Problem Solving skills - the typical physics course is more problem solving based than any other subject (except perhaps mathematics) and the problems are often more practical. If you want to be a doctor, say, skill at quickly thinking about the problems of "what is wrong with this patient" could mean the difference between life and death.

2) Real World Familiarity - Freshman physics courses tend to teach about the every-day, real, world. You learn about how things move, how they fall, what friction means, what constraints conservation of energy and momentum can put on a system.

3) Relevant information - Physics is directly relevant to the core of many fields which might seem separate at first glance.

Engineers build bridges, but they need to understand the forces involved and how bridges react to stress in order to build safe ones.
Biologists look at proteins and DNA - the structures of which are measured using diffraction techniques developed by physicists, and only really understood through physics. Biologists also use light and lasers to make fluorescence measurements to keep track of the chemicals present - physics illuminates the devices, lenses, microscopes and the very colors of the dies used!

As you can see, there are many good reasons to study physics, no matter what your career goal might be - but the most important is that physics is constantly unveiling new facts about our universe - from the very small, like new semiconductors and superconductors, to the very large, like black holes and galaxies - do you want to understand what is coming, or do you want to be left behind?

Tuesday, November 4

Composites

Materials science is a fast growing area of science, especially in engineering. It involves taking various raw or ingredient substances and making them mix, combine or react together in various ways, to produce a new material with specialised properties. Each of the ingredient substances has some useful features, and these all add together to produce the final material. One example is glass-reinforced plastic, GRP. This is made by embedding tiny fibres of glass into a type of plastic. The plastic gives overall bulk and flexibility, while the glass fibres provide extra strength, stiffness and resistance to wear. GRP is used to make boat vehicles, aeroplanes, and factory and office equipment.

Space tiles- the tiles on the undersides of space shuttles are made of heat-resistant ceramic composites. As the shuttle comes back from space into the Earth’s atmosphere, friction with the thickening air generates enormous heat. The tiles keep this heat out of the shuttle’s interior. They are checked and renewed as necessary after each mission.
Sunday, November 2

Strong as steel…most valuable metal

The world’s industriies use millions of tonnes of steels each year. Steel plate form the lrge panels in washing machines, car, trains and ships. The stainless steel used for making cutlery is an alloy with at least one-tenth of the extremely hard , shiny metal known as chromium. Steel with titanium in them form the light but stiff structure sheets in high-speed aircraft. Gold is a famous symbol of wealth. But rarer metals such as platinum and palladium command higher prices for specialised engineering and electronic uses.

Keyword : Physics Teacher's, Trial Exam
Friday, October 31

Floating ice


Most subtances enlarge or expand as they heat up, and becomes smaller or contract as they get colder. But water is unusual. It contracts as it cools down to 4 0C. Then, as it gets even colder and freezes into ice, it expands again. This means a lump of ice at 00C weighs less than the same sized lump of water at 100C. So ice from an ice cube in a drink to a giant iceberg in the ocean- floats on water.

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