Classical Physics Forum

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Join expert classical physics discussion on the principles developed before the rise of relativity and quantum mechanics. Including mechanics, electrodynamics, thermodynamics, optics.

Mechanics

I Is calling fictitious forces "not real" just about terminology?

Optics

B The focal length of the eye and image inversion

Thermodynamics

I Entropy and configurations of microstates

Electromagnetism

A Free surface problem in electrohydrodynamics
A Various questions on Galilean group (boosts and spatial translations)
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I Some questions regarding Acoustic wave reflection
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I How does pi in physics relate to circular motion and waves?
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I Mathematical disagreement with inverse square law?
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B What happens to the energy in destructive interference?
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How to interpret the difference in height between two people in this Ames room?
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Momentum question: Object dropped onto a moving railcar
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B Tangential Velocity (maybe)
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B Can Ionic Compounds conduct electricity in a gaseous state?
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I What happens to X-rays if they do not meet Bragg's law?
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B The power output of a vehicle when descending hills
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I How do I calculate brake force for an eddy current brake?
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B Why does my LC circuit not oscillate its energy between Electric & Magnetic fields?
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B Newton's Third Law Question -- Does the Earth Do Work on Me?
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B Confusion about Wave Motion
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I Regarding noise propagation
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I Gravity at Earth's poles vs equator
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A How to intuitively think of translations and Galilean boosts commuting?
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I 2D Ising Model Average Number of Domain Walls
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I Does a component of a vector have components?
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A Mass measurement in a Penning trap
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I What is the magnetic equivalent to the Coulomb?
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Sealing vacuum chamber holes air tight
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I Physical Significance of EM Plane Waves?
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B Stopping power of rifle slugs
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A Euler Lagrange Equations for simple multi-body systems
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I [Q] Lorentz force in momentum conservation view
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A Is a diffuse scatterer necessarily a Lambertian emitter?
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I Classical Field Theory - Something isn't clicking
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B Questions about Noether's theorem -- Conservation of Energy and Mass
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I Why is saxophone growling produced by modulation of the sound waves?
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B Does the shape of an object affect the pressure?
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I Some notes on stochastic physics
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B My head spins when I think about time
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B How to Fulcrum weigh camper trailer on bathroom scales?
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B Compressive force of a shorter cylindrical bone vs a longer one
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B Curious about the uniform electric field between metal plates
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B Rubber Bands & Paper Attraction
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I Solve equation from dimensional analysis: 3 eq., 6 unknowns
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B Trying to understand hydrostatic pressure
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I Curl of current density
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B Why doesn't a charged particle moving at a constant speed radiate?
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B Trying to understand hydrostatic pressure with different vessel widths
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I Modeling a ferromagnetic core moving inside a solenoid with scipy+FEMM
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A Electric and magnetic field lines in a plane wave of finite extent
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I Not a physics major -- Question about how far we can kick an object
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I How will the final output here behave?
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B If the source of the pressure distribution around a lifting airfoil is known, why is not explained in textbooks?
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A Electron drift velocity in a gas discharge
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I Noether's theorem for point particles
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B Vacuum surface area balance and force
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I Does a time varying magnetic field in vacuum produce electric field or not?
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I How Could Rarefied Space Matter Affect a Starship's Speed Near a Star?
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I Do electromagnetic waves fade with distance in vacuum?
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A Energy transfer with current in a dielectric
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B Fully submerged block in a pool of water
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B I have a doubt about the pressures at the same level of fluids
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B Can sound travel through clay?
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B Torsion Involving an Off Axis Thrust
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I How to calculate the "weight" of this piece of metal?
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I Gas Pressures and the Resistance of Materials (Biodigester Generates Methane)
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I What's the interpretation of the third term F(t)q?
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I I'm calculating more energy out than I put in
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A Thermal stresses in the stress tensor
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B The inverse-square law: Gravitational force on two falling marbles
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A What Is the Expression for Settling Velocity in a Rotating Field?
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B Speed vs. time for our Galaxy and an Observer
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I Rotating plate thrown parallel to ground
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B Magnet inside a solenoid with current
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I Light / lumens question about photography exposure times
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B Electric field on the equatorial line of a dipole
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B Rolling Without Slipping on an Inclined Plane
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B Electric Field Inside a Hollow Sphere
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A Eigenvectors of the Permittivity Tensor in Periodic Dielectrics
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B Is there any physics topic explaining how objects break into parts?
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B How is the magnet being affected in this diamagnetic application?
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B Force required to stretch training resistance bands
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I How Does Changing Mass and Spring Force Affect Watch Oscillators?
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B Work Done By Conservative Forces
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I Fluorescent lamps And Fan remote
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B Is an ellipsoid the best shape for a BBQ?
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I Can Couette Flow with Wavy Plates?
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B Calculating Heat from Drag force on a Rocket Airframe
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I Different results for the Range of a projectile
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I Electret with circular electric field
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I A problem regarding power output in cycling
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I Is this analogy between Magnetic Force and Gravitational Force accurate in helping to understand what contributes more to a stronger magnetic force?
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B Curious about Work and Energy Consumption
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B Determine forces acting on double inclined plane
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I Can I Apply Voltage to Non-Conducting Plates?
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I Does Pipe Angle Affect Hydrostatic Pressure?
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I What year were Navier-Stokes equations introduced?
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I Producing enough force with a Solenoid
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B Curious about the work - energy theorem
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B Why Did My Tennis Serve Bounce Unusually Low?
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I Is shear stress at the pipe wall the same for turbulent and laminar flows?
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B How to determine applied force when two objects collide? (basic physics engine)
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B Is the Sun's Magnetic Field About to Flip?
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B Can Lasers Really Create a Functional Light Saber?
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I Shouldn't the pressure difference along a pipe be a negative number?
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Classical Physics

Welcome to the Classical Physics forum!

Classical physics refers to the traditional theories and principles of physics developed before the advent of quantum mechanics and relativity in the early 20th century. It includes classical mechanics, electromagnetism, and thermodynamics.

Classical mechanics, formulated by Newton, describes the motion of objects and the forces acting upon them. Maxwell's equations encompass classical electromagnetism, elucidating the behavior of electric and magnetic fields. Thermodynamics, developed by Carnot and others, focuses on the principles governing heat, work, and energy transfer in macroscopic systems.

While highly successful in explaining everyday phenomena, classical physics encountered limitations at extreme scales, leading to the development of quantum mechanics and relativity to describe the behavior of particles at the atomic and cosmic levels, respectively.

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