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 Active transformation use-case in homogeneity
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B Extracting electrical energy from Orbital motion
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I The electric field due to a dipole
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I Physical Meaning of the Imaginary Part of a Wave Function
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I Gravity machine force calculations assistance needed
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I Why normal force is not equal to gravity?
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I Does the Skin Effect cause charge to accumulate on the surface of a conductor?
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I Interesting sound-making hydrogen-burning device
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I Fluid dynamics: drag coefficient and pressure at the stagnation point.
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I Transformations for isotropy in terms of math
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I Coordinate transformation for isotropy
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History - Evolution of ideas in the field of thermodynamics (statistics in mechanical and gas dynamics)
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I How find moment of inertia for car in turn?
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I Results of measurement using a magnetic sensor
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I About the use of nominal definitions in physics
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I How to understand experiment to measure heat capacity of solid?
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B Pumping water upwards into a large water tank
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B Can Jupiter gravitationally eject a pebble in orbit? A smaller mass?
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I Spring balance analysis from a system point of view
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I Different Equations of Motion for different frames
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B Fluid Flow Deflection Bending Ahead of Airfoil?
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I Measuring difference in Exercising in a Flat Surface vs one with Slope
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I Inertia/Non-inertial frame - isotropy
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Crosswind problem (pgs. 34-35, Thinking Physics, 3rd edition)
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A Magnetic bound state in classical mechanics
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I Physics of car understeer and oversteer
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B Where does the 1/2 in 1/2 at^2 come from?
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B Applying Bernoulli's equation to problems involving a perfect gas
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I Pressure: Sealed bottle physics
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I Do objects always rotate around center of mass?
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A Lagrangian: kinetic matrix Z_ij and mass matrix k_ij
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I Work in hydrostatic system in cylinder with piston: P_int or P_ext?
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B Can electrons pass through a positively charged disc in electrostatic induction?
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I Effects of gravity on planetary core structure
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I Systems and number of FBDs....
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B Proof of the relation between antenna aperture and gain
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B Am I attracted to a hydrogen atom 1 billion light years away?
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I Is it accurate to say work is motion against an opposing force?
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A Upper indices and lower indices in Einstein notation
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I Empirical temperature scales using different thermometers
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I Constant length metallic wire as a thermometer, using tension?
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I How Does Temperature Affect Wire Tension at Constant Length?
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B A contradiction of the equivalence principle?
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I Writing the Lagrangians for different frames depending on how "the ball is dropped"
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A Why the James Webb Space Telescope needs propellant
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I Does being surrounded by water affect collisions between 2 bodies?
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I Deriving formula for kinetic energy
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I An interesting question about another view of baisc mechanics'laws
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B Why don't two double pendulum apparatus follow the same paths? / Chaos
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I Analog TV reception in a spacecraft moving relative to the Earth
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B Estimate the difficulty of a mountain route
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I A Continuous Solution for Mass/Spring w/ Friction
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B Calculating g with a Conical Pendulum
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I Melting point of graphite and diamond?
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I What is the distinction between invariance and covariance?
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A Are there real-world applications of Hamilton's Principle in mechanics?
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I Question about driven harmonic oscillator
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B Why is potential difference the same across each branch in parallel?
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I Alternatives to the Lagrangian?
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I Doubts about isotropy of space
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I Open problems in nonlinear dynamics and Chaos
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I Gyroscopic precession of a spin-stabilized bullet
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B Question about Euler's formula
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I Working model to demonstrate Lagrange points L4 & L5 -- possible?
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I How is this the same as this? (two kinds of waves)
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I Lagrangian total time derivative for the velocity
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I Why does resistance reduce current in whole circuit?
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I Calculating Combined Loading Stress: Neutral Axis and Bending Moment at Point A
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I Does Larmor precession change the force exerted on a magnetic dipole?
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I Constraint Forces and Lagrange Multipliers
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B Busting the myth about achieving artificial gravity by rotating a body
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I Intuition Behind Intermediate Axis Theorem in an Ideal Setting
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I The physics behind mixing coloured pigments (questions inside post)
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I Question about Penning Trap
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I Landau's inertial frame logic
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I Requirement of Holonomic Constraints for Deriving Lagrange Equations
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A Basic Question about Gauge Transformations
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I Having trouble understanding Tensor Contraction
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B Radio waves -- Tissue Refractive Index
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B Circular wire center of gravity
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I Question about the velocity of the center of mass reference frame
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A F.E.M and Hamilton's Principle (converting differential equations into integral equations)
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I Magnetic Flux - Misleading Definition or what?
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I Does gas flow from low to high pressure?
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I Mechanics problem: A Weight and a Mass Suspended from a String
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B How are fractures in airplane structures detected by ultrasound?
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I Galilean relativity for 2 frames
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B What are complex numbers good for?
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I Help to model transmission of forces through a medium
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B What will be the ball's velocity after a perfectly elastic collision?
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Why a mug handle gets very hot when microwaved
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B Hydrostatic pressure on top of a cone filled with water
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B [SOLVED] Regarding the Superposition of Two Plane Waves
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Why is Hamilton's Principle assumed to be valid for non-holonomic systems?
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I Calculating Force on a Golf Ball when Putting on a Level Green
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B Jaan Kalda kinematics -- Radius of Curvature of a Cycloid
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I What power rating do UV-A Tubes have? (tanning salons)
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I Balloon experiment - Classical Physics vs. Statistical Physics
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A Electrostatic interaction inside and outside the source
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I Lagrangian doesn't change when adding total time derivative
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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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