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Understanding Physics & Its Homework Assignments
Physics is one of natural sciences. The
word physics originates from the Greek word of nature, fusis and was introduced
by the ancient scientist Aristotle. Obviously, physics should be science
dedicated to the study of all natural phenomena. In fact, until early
nineteenth century, physics was understood in this broad sense and as such was
referred to as the natural philosophy. During the nineteenth century and until
very recently, physics was confined to the study of processes in which the
nature of the participating subject did not change. But this definition of
physics has been discarded and we have returned to the broader and more
fundamental concept of previous times. We can define physics as a science whose
objective is to study the components of matter and their mutual interactions
and in terms of these interactions explain the properties of matter in bulk as
also the other observed phenomena.
Four Fundamental Interactions
GRAVITATIONAL
FORCE: It influences all the matter and acts
over an infinite range, possibly by means of exchange of a particle called
gravitation which has not been detected as yet. The gravitational attraction is
always attractive and does not depend upon the size or any other parameter
except inertia. It also depends on the medium of two masses. The essential
property of gravitation is to cause a change in the motion of the bodies.
ELECTROMAGNETIC FORCE:
The force that operates between charged particles is called electric force and
that which acts between magnetic poles is called magnetic force. These two
forces are closely to each other and as such are considered to be the two faces
of the general electromagnetic force. This force is described in the terms of
protons. It depends on the velocity and the magnitude of the charge.
STRONG NUCLEAR FORCE:
It is an extremely strong attractive force which binds pairs of nucleons inside
a nucleus. Nuclear force is charge independent as it appears to be unaffected
by the charge on a proton and is of the same magnitude between any two
nucleons. Nuclear force results from the exchange of mesons between the
nucleons.
WEAK NUCLEAR FORCE: It
is a kind of interaction between elementary particles that is weaker than the
strong interaction factor. It was established by Sheldon Glashow, abdus salam
and steven Weinberg in 1979 that weak interaction is associated with the
exchange of massive particles, called intermediate vector bosons which were
discovered by carlo Rubbia and simon van der meer in 1983. These recent magnetic force and the
weak interaction are two different aspects of a single electroweak force.
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