### Four Realms of Physics

Today we introduce four realms of Physical laws that govern the

universe:

(i) Classical Mechanics

(ii) Relativistic Mechanics

(iii) Quantum Mechanics

(iii) Quantum Field Theory

Let us start with our everyday life. Things are going very slow

here. ...Yes. Even on freeways in and around Boston or Los

Angeles! Those crazy drivers who are having the fun of their twisted

mind by cruising at 90 miles per hour are really too slow to catch up

with the speed of light which is about 186,282 miles per second or

about 3 hundred thousand Kilometer per second.

Things that happen in this world - the interaction of forces and

bodies - can be fully described by Newton's three laws which are

introduced in high school Physics courses. Using these equations,

we know, for example, how exactly a projectile traverses its path

in the air, how to determine the slope of a bending freeway so that

at least reasonable drivers do not topple their cars while negotiating

the curve at normal speed, etc and etc ....

In the 16th Century Newton introduced these concepts and

equations and some great Mathematical tools like Calculus to solve

and understand many such problems and mysteries of life.

In general, that is the realm of Classical Mechanics. These equations

were tested and successfully used so many times in so many cases

and situations that at the end of the nineteenth century, some

Physicists came to believe that Physics was coming to an end

... Nothing more to know or understand about Physical laws.

Twentieth century changed all that when scientists tried to look

at microscopic objects and their motion and in 1905 a clerk of

a patent office at Bern, named Albert Einstein, explained what

happens when something approaches the speed of light ...

...And we got into new arenas of Physics - Relativity and Quantum

Mechanics .. and then Quantum Field Theory....

## 1 Comments:

Gosh, all these Physics concepts sound empowering for human being to understand the world around ourselves. Yet, I must admit I did not fully understand their significance when I was taking my secondary school education.

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