RBSE Class 11 Physics Notes Chapter 1 Physical World

These comprehensive RBSE Class 11 Physics Notes Chapter 1 Physical World will give a brief overview of all the concepts.

RBSE Class 11 Physics Chapter 1 Notes Physical World

Science:
Systematic and well arranged study and knowledge of nature is Science.

Physics:
Study of fundamental laws of nature and their representation in various natural events ii called Physics.
 
Scientific method for the explanation of phenomena:
The mainly four steps are given:

• Systematic observation
• Formation of hypothesis
• Testing of hypothesis
• Final theory.

Scope of Physics:
To understand the scope of Physics it is divided in two fundamental parts.

These parts and their sub-subjects are as under:
(a) Classical Mechanics: There are following sub-subjects of this part:

• Optics
• Thermodynamics
• Mechanics
• Electro-dynamics
• Oscillations and waves.

(b) Microscope effect of Physics: There are following sub-subjects of this part:

• Nuclear Physics
• Particle Physics
• Quantum Physics.

Fundamental forces in nature:
All the events of nature can be understood with the help of four forces which are called fundamental forces. These four forces are:

• Gravitational force
• Electro-magnetic force,
• Strong nuclear force
• Weak nuclear force.

Conservation laws: Conservation law is the law which shows that which quantity remains conserved under which condition. Some conservation laws are as under.

• Conservation of energy
• Conservation of charge
• Conservation of linear momentum
• Conservation of angular momentum
• Conservation of mass-energy 

→ Energy: The capacity of doing work is called energy.

→ Nuclear force: The force acting between the nucleons (i.e. protons and neutrons) inside the nucleus is called nuclear force.