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

B Average velocity as a weighted mean

Optics

B The focal length of the eye and image inversion

Thermodynamics

I Entropy and configurations of microstates

Electromagnetism

I Why measure the speed of light in one direction?
I Euler, Calculus of Variations and Mast on a ship
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I Seesaw problem with a man connected to a fan by a rope
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I When can I treat a joint as a fixed conection?
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B Defining 1 Second: The History and Science Behind Time Measurement
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B How Does Phase Change Affect the Equation of a Stationary Wave?
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I Question regarding dh, du, cp, cv for ideal gases
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A Solution of Poisson's Equation
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A Derive Cattaneo–Vernotte Law w/Proof
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I Why is the 'motionless solution' not always valid in classical mechanics?
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I How Does Each Element in the Permittivity Tensor Matrix Represent an Anisotropic Material?
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I How Is Entropy Calculated in an Irreversible Gas Expansion?
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B Value of G Changing Over Time?
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B What are your favourite classical physics puzzles?
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B Why is Young's modulus constant below the limit of proportionality?
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A Calculating noise of a transducer from molecular vibration
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I What is the purpose of the Prandtl Mixing Length for turbulent flow?
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B Measuring a change in gravity - thought experiment question
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B What Is the Correct Calculation for Induced EMF in This Circuit Scenario?
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A How Does Jet Injection Work in Fluid Dynamics?
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B What is the Length of a Compound Microscope?
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B How do I know in which direction an object is moving?
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I Wavelength and size of holes or grating
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A Two disks -- An educational problem
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I Can Precession Explain the Stability of High-Speed Ice Skaters?
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I Unleashing Solar Energy: The Potential of Mirrored Circles and Solar Panels
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B Is Gravity Really a Force? A Look at General Relativity's Perspective
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I Can the Exact Boltzmann Distribution Yield Specific Quantum State Populations?
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B The physics explanation of ~bendy~ rays
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B Apparent missing negative phase oscillation energy - where is it?
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I Orbital maneuver by applying a thrust in the radial direction
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I How to stay warm lost in the wilderness in winter?
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I Help with Levi-Civita manipulation
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I Trying to get a physical understanding of a Fermi gas
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I Does Poynting's Theorem only involve external fields?
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I What is a good formula for the Laplace operator?
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B Variation of air density with height
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I Deriving Curl of B from Biot-Savart Law & Vector Identity
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A Is there a closed form solution to Kepler's problem?
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B Why is Gaussian charge not equivalent to SI charge?
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B Vacuum permittivty with alternative Standard-Unit for meters
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I The world from a bat's perspective (sonic images)
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B Mobility in a Strong Gravity Environment vs. Moving Mass?
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A Dx in an integral vs. differential forms
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I Variant and Invariant Physical Quantities....
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I How Does the Position of a Free Vector Couple Affect Its Behavior?
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B Understanding the Change of Variables in the Hannay Angle Proof
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B Dot Products -- Some questions to help my understanding
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I Where Can I Find Germanium PIN Photodiodes for Sale?
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I How viscous forces affect force transmission in hydraulic systems.
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B Implicit error margins based on significant figures
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I Why is it claimed that Betz's limit is a law?
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I Gibbs paradox: an urban legend in statistical physics
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I What happens if you increase μ0 and decrease ϵ0? Or vice versa
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I Units of trigonometric functions?
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B Explore the Hypothetical: What Happens to a Spinning Top with No Forces?
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A Solving Kepler's Equation Over Three Centuries
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Discovering Drum Head Patterns for Music Education
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A Parametric Lagrangian is a Homogeneous Form in Parametric Velocities?
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B Clashing approximations for this precession problem
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I Steady precession of a gyroscope
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B Photo of crosswalk lines distorted by tires action-reaction
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I Disappearing Sun: A Thought Experiment on the Effects of Gravity and Light
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I Can Joule-Thomson effect freeze air?
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B Length is the measure of intervals in space?
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I Spacetime invariance algebraic proof
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I Symmetry and Finite Coupled Oscillators
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B A bit confused about this variation
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I UV mercury lamps: Changing the 185nm vs 253.7nm ratio
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I Kinesculpture Stopping: Is It Physics or Complaints?
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I Why is action considered a scalar in physics?
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I What happens when two waves in counter phase affect a conductive material?
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I Which version of the Kepler Problem is correct?
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I Stratification of air in a closed system vs the stack effect
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B Does the Order of insulating layers matter?
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B Does Gravity decrease at a steady rate as we go away from the Earth?
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B Event horizon for observer within main horizon
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B How to Linearize an R vs θ graph (distance vs angle)
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B Adding up illuminations in lux
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I Could Physically Slamming on a Table Damage the Home Floor/Structure?
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I How to communicate between planets?
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I Van der Waals Equation: How Surface is Considered
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I Radius vector in cylindrical coordinates
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A Stress point calculation some practical help
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What is the wave intensity formula for sound?
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Example of conservative and non conservative force
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I Boundary conditions for TM and TE waves
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A Statically indeterminate systems
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I What is the Lagrangian with constraint forces?
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A How Does Noether's Theorem Extend Beyond Conservation in Hamiltonian Systems?
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A What is the purpose of modal analysis?
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I Will an AUV Ascend and Descend at the same rate?
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I What is the integral of energy?
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B Keep that wheel a-turnin' -- How much energy is required?
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B The 'all air in a room collecting on one side' adage
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B A question about the double-slit experiment
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I Help with an ideal gas canonical ensemble partition function integral
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I Does Humidity "Disperse" and "Even Out" in Enclosed Space?
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I Why Does Smoke Rise? An Exploration of Physics Principles
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I Problem about the usage of Gauss' law involving the curl of a B field
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I Understanding the concept of energy
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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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