Physical World Class 11 Notes Chapter 1

According to the CBSE Syllabus 2023-24, this chapter has been removed from NCERT Class 11 Physics textbook.

Physics is the study of matter, basic principles and laws of nature along with their manifestations. The study of physics is mainly involved in the explanations of the diverse phenomena of its concepts.

Definition of Physical World

The physical world is referred to as the complexity in nature and solving its own complexities will give us new insights into this physical world. It is referred to as the analysis of nature conducted in order to understand how the world around us performs.

Also See: CBSE Sample papers Class 11 Physics

What are the Fundamental Forces of nature?

In this diverse world, the fundamental forces which govern the phenomena occurring in it are:

  • Gravitational Force – it is a universal force that exists which is of mutual attraction between any two objects by virtue of their masses.
  • Electromagnetic Force – is the force between charged particles. If charges are in a state of rest, it is given by Coulumb’s law whereas when they are in motion, they generate a magnetic field, hence the name electromagnetic forces as they are inseparable. They also act over a large distance as seen in the case of gravitational forces without the intervention of any medium
  • Strong Nuclear Force – in a nucleus it binds protons and neutrons. It is the strongest of all the fundamental forces and is charge-independent acting between proton-proton, proton-neutron, or neutron-neutron
  • Weak Nuclear Force – observed only in some nuclear processes. Example – β-decay of a nucleus. It is not as weak as the gravitational force but weaker than the electromagnetic and strong nuclear force


To get more details on Fundamental Forces in nature, visit here.

What are the laws of conservation in nature?

The conservation laws in physics are very important when it comes to understanding the subject. The laws are:

  • Laws of Conservation of Mass
  • Laws of Conservation of Energy
  • Laws of Conservation of Momentum
  • Laws of Conservation of Charge etc

In-depth reading:

Also Access 
NCERT Solutions for Class 11 Physics Chapter 1
NCERT Exemplar for Class 11 Physics Chapter 1

Important Questions

  1. What do you think did Einstein mean when he said: “The most incomprehensible thing about the world is that it is comprehensible”?
  2. “Every great physical theory starts as a heresy and ends as a dogma”. Give some examples from the history of the science of the validity of this incisive remark
  3. “Politics is the art of the possible”. Similarly, “Science is the art of the soluble”. Explain this aphorism on the nature and practice of science.

Check out the more detailed information about Physical World class 11 notes in Chapter 1 below.

Also Read:

Class 11 Revision Notes Nucleus of an Atom and Atomic Mass

Frequently Asked Questions on CBSE Class 11 Physics Notes Chapter 1 Physics World


What is the definition of ‘physics?

The scientific study of natural forces such as light, sound, heat, pressure, etc is known as the study of physics.


What does the law of conservation of mass state?

The law of conservation of mass states that in a chemical reaction mass is neither created nor destroyed.


How are forces used in our daily life?

Forces are used at various points in our lives. For ex., the force we use to hit a ball using a bat.


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