Physics
Articles about matter, energy, forces and physical laws.
Resonance
Resonance: principle, types, and practical examples
Rest energy
Rest energy (mass–energy equivalence)
Rest mass
Resultant force
Resultant force (net force): definition, calculation and examples
Revolutions per minute
Revolutions per minute (RPM): definition, uses, and conversions
RLC circuit
RLC Circuit — Theory, Components, Damping, and Applications
Rotation
Rotation (motion about a center or axis)
Rydberg constant
Rydberg constant: definition, role in atomic spectra and historical background
Saffir–Simpson scale
Scalar (physics)
Scalar boson
Scale height
Scale height: characteristic vertical length for exponential decline
Scattering
Schrödinger equation
Schrödinger equation: the fundamental wave equation of quantum mechanics
Schrödinger's cat
Schwarzschild metric
Schwarzschild metric — the spherically symmetric vacuum solution in general relativity
Schwarzschild radius
Schwarzschild radius: definition, formula, and significance
Second law of thermodynamics
Shapiro delay
Shear modulus
Shear modulus (rigidity modulus)
Shear stress
Shock wave
Shock wave — formation, propagation, effects, and applications
Shrapnel
Shrapnel: fragments from explosions, history, effects, and distinctions
Skin effect
Skyrmion
Skyrmion: topological quasiparticle and magnetic vortex
Slinky
Snell's law
Snell's law (law of refraction)
Solar sail
Solar sail: Propulsion by light — principles, history, and uses
Solid mechanics
Solid mechanics: principles, models, and applications
Sound barrier
Space (physics)
Space (physics): the physical extent, dimensions, and spacetime concept
Space-time
Space-time: the four-dimensional continuum of modern physics
Span (unit of length)
Special relativity
Special relativity: the special theory of relativity
Spectral line
Spectrometer
Spectrometer: instrument for measuring the properties of electromagnetic radiation
Speed
Speed (physical quantity)
Speed of light
The speed of light (c) is the fundamental constant that sets the maximum signal speed in the universe, defined as 299,792,458 m/s in vacuum and central to relativity and electromag
Speed of sound
Spin
Spin (rotation, quantum property, sports, and public relations)
Spin (physics)
Spin (physics): classical rotation and quantum intrinsic angular momentum
Spin valve
Spontaneous symmetry breaking
Stability
Stability: Concepts, Types, and Applications Across Systems
Standard Model
Standard temperature and pressure
Standing wave
Static electricity
Static electricity: causes, behavior, history, and practical effects