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Physical World Cheat Sheet (DRAFT) by

The chapter "Physical World" introduces physics as the fundamental science that explains natural phenomena through observation, experimentation, and mathematical modeling. It explores the scope of physics, its relationship with technology, and its role in advancing human knowledge. The scientific method, unification of physical laws, and fundamental forces of nature—gravitational, electromagnetic, and nuclear are discussed.

This is a draft cheat sheet. It is a work in progress and is not finished yet.

What's Physics?

Physics is...
the subject of studying nature and natural phenomena.
Branches of Physics:
 
>Me­chanics
 
>Waves and Oscill­ations
 
>Heat and Thermo­dyn­amics
 
>El­ect­rod­ynamics
 
>Pr­ope­rties of Matter and Fluid Mechanics
 
>Optics and Relativity
 
>Atomic Physics
 
>Nu­clear Physics
 
>El­ect­ronics and Commun­ication
 
>As­tro­physics
 
>Co­mputer Science

Nature of Physical Laws

i) Conser­vation of Mechanical Energy: For motion due to external force, the mechanical energy is constant.
ii) Conser­vation of Total Energy of an Isolated System: If some of the forces are non-co­nse­rva­tive, the mechanical energy is tranformed into other forms.
iii) Conser­vation of Mass Plus Energy: the total (mass+­energy) of the universe is conserved.

The Fundam­ental Forces in Nature