Physics
Articles about matter, energy, forces and physical laws.
Fermion
Fermion: elementary particles that make up matter
Fermionic condensate
Ferromagnetism
Feynman diagram
Feynman diagram: visual language for particle interactions
Field (physics)
Field strength
Filament
Filament: elongated structures across physics, astronomy, and biology
Fire triangle
First law of thermodynamics
First law of thermodynamics (conservation of energy)
The first law of thermodynamics states that energy cannot be created or destroyed, only transformed. It quantifies exchanges of heat and work and applies to closed systems, underpi
Fluid
Fluid dynamics
Fluid dynamics: principles, history, and applications
Fluid mechanics
Fluid statics
Fluorescence
Fluorescence: light emission by energized materials
Flux
Flux: concept, definitions, examples, and uses in science and mathematics
Flywheel
Focal length
Focus (optics)
Focus (optics): image points, limits, and practical implications
In optics, a focus is where light from a point source is brought together to form an image. This article explains how focus is produced, real vs virtual images, practical limits an
Foot-pound force
Foot‑pound force (ft·lbf)
Force
Force (physics): definition, types, and effects
A concise encyclopedia article on force: its definition in physics, vector nature, contact vs. field forces, Newton’s laws, the four fundamental forces, history, examples, and prac
Force field
Force field — physical fields and fictional energy barriers
Foucault pendulum
Frame of reference
Frame-dragging
Frame dragging (Lense–Thirring effect)
Free fall
Free fall (physics)
Free fall: motion under gravity alone. Overview of definition, equations, history, examples (projectiles, skydivers, spacecraft), terminal velocity and distinctions like weightless
Free-electron laser
Free-electron laser (FEL): principles, history and applications
Frequency
Fresnel lens
Fresnel lens — design, history and applications
Friction
Fundamental force
Fundamental force (four fundamental interactions)
Fusion power
Fusion power: principles, development, and prospects
G-Force
G-force: acceleration relative to gravity and its effects
Gamma ray
Gas-filled tube
Gas-filled tube: principles, history, types, and applications
Gauge boson
Gauss (unit)
Gauss (unit of magnetic flux density)
Gauss's law
Gauss's law: statement, meaning, history and applications
Gauss's law for magnetism
Geiger–Marsden experiment
Geiger–Marsden experiment (Gold foil or Rutherford experiment)
General relativity
General relativity: Einstein’s theory of gravitation and spacetime
Giant magnetoresistance
Giant magnetoresistance (GMR): principles, history and applications
Gluon
Gluon (carrier of the strong interaction)
Grand unification theory
Gravitational constant
Gravitational constant (G): definition, measurement and significance
The gravitational constant G quantifies the strength of Newtonian gravity. This article explains its meaning, units, measurement history, roles in physics, and common confusions su
Gravitational energy
Gravitational energy — concepts, formulas, and practical examples
Gravitational field
Gravitational singularity
Gravitational wave
Gravitational Waves: Theory, Astrophysical Sources, and Detection