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 Derivation of Hamilton's Principle: Questions

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
I Gauss' law seems to imply instantaneous electric field
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I Do electron density waves accompany EM waves in coaxial cables?
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B Highway: Deriving speed from Doppler shift
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I To predict the nature of Normal Reaction in any mechanics set-up
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I What areas of maths and physics do I need to understand explosion physics?
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A Advice for 100 MHz resonator
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I Off resonance driving of a MW/RF cavity
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9
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136
B What qualities does time have other than linearity, motion, and speed?
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B Light speedup question
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11
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252
B Question about pressure of a liquid
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8
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330
B Why is the 3 body problem unsolvable? And what will happen if someone solves it?
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26
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504
I Relationship between nuclear magnetic physics and Maxwell's demon
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200
B Why is displacement the integral of acceleration with respect to time? [corrected in thread]
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4
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222
I Feynman's derivation of average square distance variation in Brownian motion
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3
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254
I Deriving the conformal Laplacian
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199
B Understanding Newton's Third Law and the Net Force on Objects
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10
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295
B Work done when moving an object
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290
B Why Does a Spring Return to Its Original Position After Being Stretched?
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B Simple mass/scale puzzle
5
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B Ultrasonic wave and regular sound wave
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4
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421
A When should I analyze optical problems using ray tracing vs. wavefront analysis?
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12
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I Topic about physics axioms, theory, laws etc..
2
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B Why Does Hooke's Law Use a Negative Sign in Scalar Form?
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I Is ##p^k = \partial L / \partial \dot{x}^k## true for all ##L##'s?
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B Which technique has been used? (drowning victim recovery in a lake)
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19
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551
I Shielding behavior of a steel cuboid in a DC magnetic field
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354
I Reframing Light Bending Using Density Instead of Radius
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617
I Intuitive look at bending of light by gravity
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25
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960
I A "continous" gravitational field formula r=0 to infinity
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655
I Board Breaks: Small or Large Deflections?
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I Visualising rotation in 3-D space
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B (Electric) current is not a vector quantity
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B Use Surface-Volume to approximate gravity for planets and protons
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I Describe the Physics involved in swinging a rope to catch a cow
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B An explosion under a pile of timber and rocks
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I Color and appearance of a "pile" of biological viruses
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I Boundary conditions for a wooden board used for breaking in martial arts
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20
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I Explaining the magnetic (cable) paradox
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5
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620
I Problem with light-ray construction
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4
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601
I What does the Lattice Boltzmann Equation actually say?
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8
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708
B EMF induced by Bar Magnet falling through a Coil
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3
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I Does kinetic friction propel a person walking forward?
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I Is Mechanical Energy Conservation Free of Ambiguity - follow up
2
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B Slow Motion Appearance of Flags: Fluid Dynamics or Perceptual Illusion?
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7
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684
B Why do sails on a boat generate lift perpendicular to the sails?
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9
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912
I Interception problem with curve (computer simulation)
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9
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741
B Problems with modelling the vertical motion of a dust particle
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15
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788
B Deacceleration causes object to move backwards?
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10
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863
B Question about Newton's 3rd law: Two boxes sliding toward each other and colliding
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743
I Air flow between sphere/cylinder and membrane
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B The horizontal speed of an object does not affect the time it takes to fall vertically?
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22
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B What limits a rocket's max speed if in space drag is zero?
2
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I A thought about visualizing space-time
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24
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951
B Inertia of a rolling dumbell
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695
I Permeability of Metglas and Propagation Velocity
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5
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I Explain Bernoulli at the molecular level?
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B Symbol for temperature on the Fahrenheit scale
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13
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Is Velocity Increasing Below the X-Axis?
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I Bose-Einstein statistics for μ>ε
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I Problems with Blum's Karate Article
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848
I Are 1D Longitudinal Waves Reflected at an Open End?
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B Temperature-Dependence of Viscosity of a Fluid?
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I Weird Depictions of Birefringence with Angle of Incidence 0°
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913
I Questions about Jean-Rayleigh's derivation of Ultraviolet Catastrophe
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B Mass and space in atoms
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First law of this universe
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25
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B Why do objects bounce?
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B How to use magnets in levitation?
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3
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B Would there be any varying forces acting on individual wells in rotation? (stir/shaker plate)
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9
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I Is there action at a distance at the atomic level in physics?
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I Two kinds of pressure
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I Creating White LEDs: Phosphor vs RGB
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5
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B Doubt regarding relative acceleration
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I Solving a momentum problem where masses change after the collision
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B Not sure about the magnetic flux (phi) depending on a cosine function
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9
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1K
B Is water pressure on an inclined wall less than the weight of the water?
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31
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A Flaw in Lagrangian Mechanics for a rotary inverted pendulum system? (Simulation vs. Measured)
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11
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B Electric Field Direction: Are We Assuming a Universal Positive Frame?
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B Constant jerk motion: acceleration vs. position
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I Magnetic field inside a capacitor
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I Gravitational Force Calculation w/ Superposition Principle
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B Why did Rutherford conclude the atom was mostly empty space?
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A RLC oscillator vs class A or B amplifier for EM induction
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I Will water of uniform temperature with perfect insulation stratify?
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I Determine angle of initial momentum in zero reference frame
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A Calculate velocity of streams impinging at differing angles
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B Formal definition of work done
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B Torque Calculation - Not a basic application
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B What is Mass?
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B Why does hot water rise to the top of a water heater?
2
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B Will there be water coming out of the last hole?
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B Measuring Shock Absorbency / Kinetic Energy
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I Magnetic Component Permeability vs Frequency Loss
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I Focusing sound waves from the environment
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I How deep does it need to go for a physics theory to be consistent?
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B Conservation of energy demo -- An upgrade to the standard version
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B Why do things burn up in the atmosphere but not in the ocean?
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I A Mathematica code to plot two functions on the same screen
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A Historical clarification of the Planck formula of blackbody radiation
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I What will be the boiling point of fully-filled water in a vacuum container?
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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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