Physical World Class 11 Notes

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Physical World

Be it Science, Arts, or Commerce stream, Class 11th is a crucial junction in a student’s life. It forms a base for higher education and various entrance exams which one may have to give based on the degree of interest. When it comes to the Science stream, Physics is considered toughest amongst all, and thus, understanding the topics and course curriculum is important. The Physics syllabus for class 11 is a collation of interesting chapters like Motion in a Plane, Eave and Oscillations, Units and Measurement, etc. However, before delving deep into each and every module, it is essential to develop a clear understanding of the basic fundamentals of the physical world, which also is the 1st chapter of the NCERT class 11 book. So, let’s get started and learn through Physical World Class 11 Notes.

What is Science?

Physical world describes that you can think of Science as the methodical endeavour of comprehending phenomena that occurs naturally around us. Since our surroundings are governed by different laws of nature, the knowledge gained in the process is utilized for predicting, correcting, and controlling these phenomena. In simpler terms, the objective of Science is to examine, test, and predict these phenomena around us.  

What is Physical World in Physics?

In order to bring requisites changes to our surroundings, it is important to understand the way it works. This is done through Scientific methods which include several interrelated steps such as systematic observations, structured experiments, qualitative and quantitative reasoning, mathematical modelling, prediction, validation, or false theory. 

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What is Physics?

An important component of the physical world, Physics can be broadly explained as an exploration of the basic laws of nature and their appearance in various natural phenomena. In physics, we try to explain different physical phenomena in terms of certain concepts and laws. An effort has been made to see the material world as an expression of several natural laws in various fields and situations. For example, the Law of Gravity (introduced by Newton) describes falling apples on the earth, lunar orbital motions, and planetary orbital motions. Similarly, the Basic Laws of Electromagnetism (Maxwell’s equations) govern all electrical and magnetic phenomena.

Credits: LearnoHub

Classical Physics

Out of the many branches of Physics, Classical Physics is concerned with the study of the phenomenon which occurs at the macroscopic level. It includes topics such as electrodynamics, mechanics, thermodynamics, and optics. Classical along with Modern Physics form an integral part of the physical world. 

Physical World, Technology and Society

Technology and physics are inter-related. At times, technology gives rise to new concepts in Physics, whereas at other times, theories of physics are utilized to create new technologies.  Sometimes technology leads to the emergence of new theories in physics. An example of this is wireless communication technology after the discovery of the basic laws of electricity and magnetism in the 19th century.

Important Terminologies

Now that you have understood the various facets of Physics, let us understand some of the important terms which are used very often to describe events in the physical world. 

Force In the physical world, there are four basic forces of nature that dominate the microscopic world and its various phenomena. These are “gravity”, “electromagnetic force”, “strong nuclear power”, “and weak nuclear power”. 
Gravity Gravity is an attractive force that pulls objects towards itself. This happens due to the mass between two objects. 
Electromagnetic Force Be it at stationery or moving potion, The electromagnetic force is the force between charged particles. 
Strong Nuclear Force Strong nuclear forces link protons and neutrons to the nucleus. It is clear that in the absence of an attractive force, the nucleus will become unstable due to electrical rejection between the protons. This pull is not attractive because gravity is negligible compared to electric power. Therefore, new fundamental forces must be exercised.
Weak Nuclear Force You can observe the play of weak nuclear forces in phenomena like nuclear fission. When the ß dissolves, the nuclei emit uncharged electrons and particles known as the neutrino. Weak nuclear forces are not as weak as gravity, but much weaker than strong nuclear or electromagnetic forces. The range of weak nuclear forces is very small.
Conservation Laws In the physical world, the physical quantities which cannot be changed are called conserved quantities. This phenomenon is explained via laws of conservation like conservation of mass, linear momentum, energy, charge, angular momentum, parity, etc.

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Physical World Map

Physical World Class 11 Notes
Credits: MapsofIndia.com

Physical World Class 11 for NEET

This is also a relevant and important topic for students aspiring to clear NEET. Here are some of the important questions related to physical world class 11 for NEET:

  1. Elucidate the difference between Technology and Science.
  2. What do you understand by Nuclear Force?
  3. State some differences between Strong and Weak Nuclear Force.
  4. Cite some examples to explain the role of Physics in our day-to-day life. 
  5. Briefly explain Quantum Physics. 
  6. Which are the fundamental forces that exist in nature?

Physical World Class 11 Questions and Answers

What is reductionism?

Reductionism is the effort to extract larger and more complex system properties from their simple component features and interactions.

What are Hypotheses, Axioms, and Paradigms in the physical world?

The chapter Physical World of class 11th book suggests that there are some phenomena, which cannot be mathematically proven. Physics cannot provide a befitting explanation of the concepts. Hence, these concepts of physics and mathematics which are based on assumptions are called hypotheses, axioms, models, etc.

This was all about the Physical World Class 11 Notes. Understanding the basic concepts related to Physical World is essential not only for Indian competitive exams like NEET, JEE Advanced, but also for the SAT exam. If you are planning to pursue higher education abroad after 12th then we, at Leverage Edu are here to not only provide guidance throughout the admission process but will also help you prepare for the SAT exam through our comprehensive Leverage Live online sessions!

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