Physics Basics
Physics · भौतिकी की मूल बातें · 13 facts
Physics: study of nature and natural phenomena; from Greek 'Physis' meaning nature
Physics is called the Father of all Sciences
7 fundamental quantities: length, mass, time, temperature, current, amount of substance, luminous intensity
Scalar quantity has only magnitude (speed, mass, distance); Vector has magnitude + direction (velocity, force)
Distance is scalar; Displacement is vector — same concept, different type
Speed is scalar; Velocity is vector (speed with direction)
Main branches: Mechanics, Optics, Thermodynamics, Electromagnetism, Nuclear Physics
Galileo Galilei: Father of Modern Physics and Observational Astronomy
Isaac Newton: Father of Classical Mechanics; gave 3 Laws of Motion and Law of Gravitation
Albert Einstein: Theory of Relativity (1905); E = mc² — mass-energy equivalence
Derived quantities are formed from fundamental quantities — e.g. Force = mass × acceleration
Dimensional analysis checks correctness of physical equations using [M], [L], [T]
Accuracy = closeness to true value; Precision = consistency of repeated measurements