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What is Physics?

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Topics

  • What is Physics?
  • Two thrusts in physics : Unification and Reductionism
CBSE: Class 11
Tamil Nadu Board of Secondary Education: Class 11
National Testing Agency: Class 12

What is Physics?
  • The Greek term “Fusis”, which means nature, is where the word ‘physics comes from.
  • Bhautiki, its Sanskrit equivalent, is a term for the study of the physical universe.
  • Aristotle coined the term ‘Physics’ in the year 350 BC.
  • Physics deals with the study of nature and natural phenomena. We expect that all these different events in nature take place according to some basic laws, and revealing these laws of nature from the observed events is physics.
  • Physics is concerned with the fundamental rules that regulate all dimensions of life. As a result, physics is regarded as the most fundamental of all sciences.

There are two main thrusts in physics:

1) Unification:

  • Unification is the process of attempting to describe various physical phenomena using just a few ideas and laws.
  • Only one law explains so many phenomena. It becomes convenient for us to study only one law and understand too many phenomena.
  • For example, Newton’s universal law of gravitation explains the motion of freely falling bodies toward the Earth, the motion of planets around the Sun, and the motion of the Moon around the Earth, thus unifying the fundamental forces of nature.

2) Reductionism:

  • Reductionism is an effort to describe a macroscopic entity in terms of its microscopic components.
  • In this, we derive properties of a bigger, more complex system from the properties and interaction of its constituent simpler parts
  • For instance, thermodynamics was created to describe the macroscopic characteristics of bulk systems, such as temperature, entropy, etc. Kinetic theory and statistical mechanics have interpreted the previously stated characteristics in terms of the molecular components (microscopic) of the bulk system.

Related QuestionsVIEW ALL [86]

A dimensionless quantity

Let \[\vec{a} = 2 \vec{i} + 3 \vec{j} + 4 \vec{k} \text { and } \vec{b} = 3 \vec{i} + 4 \vec{j} + 5 \vec{k}\] Find the angle between them.

Let x and a stand for distance. Is
\[\int\frac{dx}{\sqrt{a^2 - x^2}} = \frac{1}{a} \sin^{- 1} \frac{a}{x}\] dimensionally correct?

The electric current in a charging R−C circuit is given by i = i0 e−t/RC where i0, R and C are constant parameters of the circuit and t is time. Find the rate of change of current at (a) t = 0, (b) t = RC, (c) t = 10 RC.

In a submarine equipped with sonar, the time delay between the generation of a pulse and its echo after reflection from an enemy submarine is observed to be 80 s. If the speed of sound in water is 1460 ms-1. What is the distance of an enemy submarine? 

\[\int\frac{dx}{\sqrt{2ax - x^2}} = a^n \sin^{- 1} \left[ \frac{x}{a} - 1 \right]\] 
The value of n is

Suppose a quantity x can be dimensionally represented in terms of M, L and T, that is, `[ x ] = M^a L^b T^c`.  The quantity mass

A vector \[\vec{A}\] makes an angle of 20° and \[\vec{B}\] makes an angle of 110° with the X-axis. The magnitudes of these vectors are 3 m and 4 m respectively. Find the resultant.

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