Physics basics

Physics basics


Physics basics – Physics is that branch of science which deals with the study of the phenomena of nature. The word “physics’ itself is derived from a Greek word meaning nature.

What do you understand by the word ‘science’?

A systematic knowledge collected through experimental observation of the natural events is known as science.

what do you mean by physical word?

Universe or physical world implies the collection of living or non living objects around us.

Scope and excitement of physics

A) Physics deals with a wide variety of fields such as mechanics, sound, electricity, magnetism, optics, modern physics etc. Through there is great diversity in the fields but there is much similarity I the concepts, principles and methods of analysis used in these fields.

B) The field of mechanics deals with the study of the properties and laws of solids, liquids and gases. For example, it helps us to know the forces involved in the free fall of rain drop, in the collision between two objects, in the motion of a body rolling down an inclined plane and so on. The study of heat helps us to know the rise and fall of temperatures, the working of heat engines and refrigerators, the transmission of heat and so on. In sound, we try to understand how a study of vibrations and waves can be used to understand the various characteristics of music, speech etc.

Optics covers itself with various phenomenon connected with the behavior of electric charges when at rest and when at motion. The present century has witnessed a significant revolution both in theoretical and, experimental physics, leading to a series of exciting developments. All these developments come under the preview of a field known as Modern Physics. It is most existing discipline of physics now days, which takes us into highly microscopic word of atoms, nuclei and electrons.

C) Through the physical phenomenon is quite diverse in nature but even then it is quite easy to understand it. For example, the length, mass and tie intervals possess a very wide range, but the methods of physics enables us to measure all of them (length can be as small as 10-14m i.e. size of nucleus and can be as large as 1025 m i.e. size of universe; mass may vary from 10-30 kg i.e. mass of an electron, to 1055 kg i.e., mass of universe).

This has been possible due to following facts.

i) A quantitative study of the observation informs us that enormous number of measurements can be understood in terms of only a very small number of laws. For example, through the measurement of length, mass and time vary over a very large range, but even then only a very small number of principles are required to measure and understand them.

ii) When less important features of a physical phenomenon are distinguished from more important ones, then the phenomenon can be easily understood.