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Classical Physics Forum

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?

Yesterday, 3:16 AM

Optics

I How do I stretch a laser from a beam into a sheet?

Today, 12:04 AM

Thermodynamics

I What thermal cycle would describe the action of a candle carousel?

Yesterday, 1:51 PM

Electromagnetism

A Reflections at the source point of a transmission line

Oct 31, 2025

Filters

Calculating & Using Bending Moments: Cantilevers vs. Euler's Strut

Mar 25, 2011 · Replies 8 · Mar 27, 2011

Replies: 8

Views: 5K

Does the nabla operator has a unit?

Mar 26, 2011 · Replies 6 · Mar 27, 2011

Replies: 6

Views: 5K

S-Curve Equations: Modeling 7 Segment Motion Profile

Sep 27, 2010 · Replies 12 · Mar 26, 2011

Replies: 12

Views: 26K

How do I know if the Hamiltonian is constant?

Mar 26, 2011 · Replies 9 · Mar 26, 2011

Replies: 9

Views: 7K

Two questions. 180 degrees out of phase.

Mar 25, 2011 · Replies 6 · Mar 26, 2011

Replies: 6

Views: 10K

Question on transformation of coordinates.

Mar 24, 2011 · Replies 29 · Mar 25, 2011

Replies: 29

Views: 9K

What Forces Encourage Liquid Down a Straw?

Mar 25, 2011 · Replies 1 · Mar 25, 2011

Replies: 1

Views: 6K

How Does Rubidium Iodide Electrolyte Affect Pseudocapacitor Energy Density?

Mar 10, 2011 · Replies 2 · Mar 25, 2011

Replies: 2

Views: 8K

Type of mechanism is mounted on the living room?

Mar 24, 2011 · Replies 5 · Mar 25, 2011

Replies: 5

Views: 3K

Closed systems and mass/energy transference

Mar 24, 2011 · Replies 1 · Mar 24, 2011

Replies: 1

Views: 3K

Can you clarify the question?What is the meaning of independent in this context?

Mar 23, 2011 · Replies 11 · Mar 24, 2011

Replies: 11

Views: 3K

How fast does hot air rise and disperse?

Mar 23, 2011 · Replies 10 · Mar 24, 2011

Replies: 10

Views: 22K

Help Sort My Confusion on dH, TdS and dQ

Mar 24, 2011 · Replies 7 · Mar 24, 2011

Replies: 7

Views: 8K

The Longest Focal Length for Lenses & Mirrors

Mar 23, 2011 · Replies 1 · Mar 23, 2011

Replies: 1

Views: 2K

Was Feynman right about energy?

Mar 23, 2011 · Replies 9 · Mar 23, 2011

Replies: 9

Views: 12K

How to Measure Gravity, or Gravitational Pull?

Mar 22, 2011 · Replies 2 · Mar 23, 2011

Replies: 2

Views: 4K

Understanding Wood's Anomaly in Optics

Jan 9, 2009 · Replies 2 · Mar 22, 2011

Replies: 2

Views: 26K

Representing Gravity as a Vector Field

Mar 22, 2011 · Replies 2 · Mar 22, 2011

Replies: 2

Views: 10K

Cause of Gravitation: What Is It?

Mar 19, 2011 · Replies 3 · Mar 22, 2011

Replies: 3

Views: 1K

Determining if a force is making a difference

Mar 21, 2011 · Replies 3 · Mar 21, 2011

Replies: 3

Views: 2K

Moon Center of Mass/ Center of Gravity

Mar 16, 2011 · Replies 6 · Mar 21, 2011

Replies: 6

Views: 7K

Art project involving the moon

Mar 20, 2011 · Replies 12 · Mar 21, 2011

Replies: 12

Views: 4K

Solving a Lagrangian using an Ansatz

Mar 21, 2011 · Replies 1 · Mar 21, 2011

Replies: 1

Views: 2K

Solving Forced Wave Equation with Causal Boundary Conditions

Mar 16, 2011 · Replies 3 · Mar 20, 2011

Replies: 3

Views: 3K

What the Sun will do with long rod?

Mar 18, 2011 · Replies 12 · Mar 20, 2011

Replies: 12

Views: 3K

Proving Ideal Gas Law: dU/dV and dH/dP at Constant T

Mar 20, 2011 · Replies 1 · Mar 20, 2011

Replies: 1

Views: 2K

G-Force in Motorcycle Accident from 30mph to 0mph

Mar 12, 2011 · Replies 3 · Mar 19, 2011

Replies: 3

Views: 2K

Hyperfocal distance v. far-field

Mar 19, 2011 · Replies 1 · Mar 19, 2011

Replies: 1

Views: 2K

Could Zero Distance Create Infinite Gravitational Force?

Mar 18, 2011 · Replies 6 · Mar 19, 2011

Replies: 6

Views: 3K

Do We Experience a Centrifugal Force from Earth's Orbit Around the Sun?

Mar 19, 2011 · Replies 7 · Mar 19, 2011

Replies: 7

Views: 7K

Doppler Shift at Right Angles Confusion

Mar 17, 2011 · Replies 7 · Mar 19, 2011

Replies: 7

Views: 5K

If a uniform beam was in space and only was applied a force on one side (Stress)

Mar 18, 2011 · Replies 7 · Mar 18, 2011

Replies: 7

Views: 3K

Does the Cheerio Effect Occur in Zero-Gravity?

Mar 17, 2011 · Replies 2 · Mar 18, 2011

Replies: 2

Views: 2K

Buoyancy force calculation question

Mar 17, 2011 · Replies 1 · Mar 18, 2011

Replies: 1

Views: 3K

Is the Huygens principle incomplete when applied to real waves?

May 24, 2008 · Replies 6 · Mar 17, 2011

Replies: 6

Views: 10K

How can we define material properties using Maxwell's equations?

Mar 16, 2011 · Replies 4 · Mar 17, 2011

Replies: 4

Views: 9K

F=μmg. How was μ calculated? Obviously experiments were

Mar 6, 2011 · Replies 37 · Mar 16, 2011

2

Replies: 37

Views: 6K

Can a Bullet Hole Cause Explosive Decompression in a Submarine at 30m Depth?

Mar 15, 2011 · Replies 4 · Mar 16, 2011

Replies: 4

Views: 3K

Can Two Batteries Simultaneously Act as Both the Source and Load in a Circuit?

Mar 16, 2011 · Replies 4 · Mar 16, 2011

Replies: 4

Views: 2K

What is a Hamiltonian vector field in General Relativity?

Mar 12, 2011 · Replies 4 · Mar 16, 2011

Replies: 4

Views: 3K

Investigating an Unexpected Ice Spike Formation

Mar 9, 2011 · Replies 3 · Mar 15, 2011

Replies: 3

Views: 2K

Why is Biot-Savart Law Zero for Cylinderical Uniform Current Density?

Mar 15, 2011 · Replies 2 · Mar 15, 2011

Replies: 2

Views: 2K

Moment of Intertia for changing COG

Mar 13, 2011 · Replies 1 · Mar 14, 2011

Replies: 1

Views: 3K

Jacobi least time vs. Fermat Hamilton

Mar 11, 2011 · Replies 3 · Mar 13, 2011

Replies: 3

Views: 2K

Verify Integration and differentiation of a vector.

Mar 12, 2011 · Replies 6 · Mar 12, 2011

Replies: 6

Views: 3K

Deriving 1D Wave Equation for Vibrating Guitar String

Mar 11, 2011 · Replies 5 · Mar 12, 2011

Replies: 5

Views: 6K

Intensity with distance of LED

Mar 10, 2011 · Replies 1 · Mar 12, 2011

Replies: 1

Views: 2K

How can we find out from the Lagrangian if energy is conserved?

Mar 10, 2011 · Replies 2 · Mar 11, 2011

Replies: 2

Views: 3K

What holds solid matter together?

Mar 8, 2011 · Replies 19 · Mar 11, 2011

Replies: 19

Views: 35K

Cast Focused Shadow: Solutions and Tips

Mar 10, 2011 · Replies 3 · Mar 11, 2011

Replies: 3

Views: 4K

Understanding Steam at High Pressures: Enthalpy and Volume Explained

Mar 10, 2011 · Replies 1 · Mar 10, 2011

Replies: 1

Views: 3K

How Does Poynting's Theorem Explain Ohmic Loss?

Mar 7, 2011 · Replies 2 · Mar 9, 2011

Replies: 2

Views: 2K

Understanding Hamiltonian Field Equations and Their Applications in Field Theory

Mar 6, 2011 · Replies 8 · Mar 9, 2011

Replies: 8

Views: 3K

2-form and dissipative systems

Feb 22, 2011 · Replies 39 · Mar 9, 2011

2

Replies: 39

Views: 7K

Can my dining table hold four times its weight before tipping?

Mar 8, 2011 · Replies 4 · Mar 8, 2011

Replies: 4

Views: 8K

Rectangular wave guide, TE01 mode

Feb 27, 2011 · Replies 23 · Mar 8, 2011

Replies: 23

Views: 8K

Navier stokes equeations, shear term

Mar 2, 2011 · Replies 4 · Mar 8, 2011

Replies: 4

Views: 3K

Mie/Rayleigh Phase Function Differences

Mar 7, 2011 · Replies 6 · Mar 8, 2011

Replies: 6

Views: 6K

EM Field Lagrangian: What Defines It?

Mar 6, 2011 · Replies 5 · Mar 7, 2011

Replies: 5

Views: 3K

Basic Gaussian Surface Conceptual Problem

Mar 7, 2011 · Replies 2 · Mar 7, 2011

Replies: 2

Views: 2K

Confused about Poynting Theorem and Retarded field.

Mar 4, 2011 · Replies 4 · Mar 7, 2011

Replies: 4

Views: 2K

Electricity, Heat, and Energy - Quality & Conversion

Jan 9, 2007 · Replies 5 · Mar 6, 2011

Replies: 5

Views: 4K

What is the difference between ?

Mar 3, 2011 · Replies 4 · Mar 6, 2011

Replies: 4

Views: 6K

How Do Spinning Tops and Suspended Magnets Exhibit Surprising Physics?

Mar 2, 2011 · Replies 4 · Mar 4, 2011

Replies: 4

Views: 2K

Hi i'm an applied maths student i'd like to study about catenary

Mar 3, 2011 · Replies 2 · Mar 4, 2011

Replies: 2

Views: 2K

Are Tiles Non-Conductors? Earth Safety in Physics Lab

Mar 2, 2011 · Replies 6 · Mar 4, 2011

Replies: 6

Views: 2K

LEDs for Growing Indoor Plants: Efficient Luminous Efficacy

Mar 2, 2011 · Replies 1 · Mar 3, 2011

Replies: 1

Views: 2K

What force acts on the material of the capacitor in the Graham-Lahoz experiment?

Feb 27, 2011 · Replies 4 · Mar 3, 2011

Replies: 4

Views: 3K

Solving an Impossible Problem - Frictionless Train Car??

Feb 24, 2011 · Replies 42 · Mar 3, 2011

2

Replies: 42

Views: 8K

Differential and derivatives [HELP]

Mar 1, 2011 · Replies 4 · Mar 2, 2011

Replies: 4

Views: 4K

Question on a step in deriving Poynting Theorem.

Mar 1, 2011 · Replies 3 · Mar 2, 2011

Replies: 3

Views: 2K

Hamilton-Jacobi Theory: Why No Time Dependence?

Feb 21, 2011 · Replies 5 · Mar 1, 2011

Replies: 5

Views: 3K

How Should Wind Turbine Blades Be Designed for Maximum Efficiency?

Mar 1, 2011 · Replies 3 · Mar 1, 2011

Replies: 3

Views: 8K

Calculating constant field lines

Feb 28, 2011 · Replies 5 · Feb 28, 2011

Replies: 5

Views: 5K

Conjecture about parallel and series circuits

Feb 27, 2011 · Replies 3 · Feb 28, 2011

Replies: 3

Views: 2K

Fuseable Link Design for ATV Axle Shafts

Feb 28, 2011 · Replies 1 · Feb 28, 2011

Replies: 1

Views: 1K

How Is Spatial Coherence Derived from Heisenberg's Uncertainty Principle?

Feb 27, 2011 · Replies 1 · Feb 27, 2011

Replies: 1

Views: 2K

Solving a Complex Problem: Analysis and Comparison of Different Approaches

Feb 26, 2011 · Replies 2 · Feb 27, 2011

Replies: 2

Views: 2K

The average energy = the most probable energy?

Feb 26, 2011 · Replies 2 · Feb 26, 2011

Replies: 2

Views: 7K

Center of mass without calculus has basically only 1 formula?

Feb 26, 2011 · Replies 2 · Feb 26, 2011

Replies: 2

Views: 2K

Gravity's Effect on Height: Function Explained

Feb 24, 2011 · Replies 5 · Feb 25, 2011

Replies: 5

Views: 11K

Charge Buildup & Equalization on Batteries A & B

Feb 22, 2011 · Replies 35 · Feb 25, 2011

2

Replies: 35

Views: 5K

How Much Force Is Needed to Retrieve a Sunken Barge on a Rocky Slope?

Feb 24, 2011 · Replies 3 · Feb 24, 2011

Replies: 3

Views: 2K

What is the physical interpretation of this calculus of variations problem?

Feb 23, 2011 · Replies 2 · Feb 24, 2011

Replies: 2

Views: 2K

Why does a solenoid coil move when a large current is sent through it?

Feb 21, 2011 · Replies 2 · Feb 23, 2011

Replies: 2

Views: 2K

Gravity Equation and Immersed Objects: Validity and Proofs

Feb 21, 2011 · Replies 5 · Feb 22, 2011

Replies: 5

Views: 2K

Why Do Feet Sink in Sand on Beaches?

Feb 22, 2011 · Replies 2 · Feb 22, 2011

Replies: 2

Views: 2K

Breaking down forces in three dimensions.

Feb 21, 2011 · Replies 4 · Feb 22, 2011

Replies: 4

Views: 3K

Computation of direct warming of atmosphere by burning oil

Feb 21, 2011 · Replies 1 · Feb 21, 2011

Replies: 1

Views: 2K

Hypothetical questions with a closed system

Feb 19, 2011 · Replies 6 · Feb 20, 2011

Replies: 6

Views: 2K

Conductors with off-centered cavity

Feb 19, 2011 · Replies 5 · Feb 20, 2011

Replies: 5

Views: 5K

Gravitational Potential Energy of Liquid: Why Does It Increase?

Feb 19, 2011 · Replies 6 · Feb 20, 2011

Replies: 6

Views: 2K

Weighing fluids with immersed objects

Feb 19, 2011 · Replies 1 · Feb 19, 2011

Replies: 1

Views: 1K

Correct exaggerated drawing of tides

Feb 19, 2011 · Replies 7 · Feb 19, 2011

Replies: 7

Views: 3K

Solving Sliding Sideways: Block Speed After Long Time

Feb 19, 2011 · Replies 2 · Feb 19, 2011

Replies: 2

Views: 3K

Demystifying the Equation: Understanding the Meaning of Variables in dp/dt=F

Feb 19, 2011 · Replies 3 · Feb 19, 2011

Replies: 3

Views: 2K

Endothermic reaction: where has the energy disapeared?

Feb 16, 2011 · Replies 11 · Feb 18, 2011

Replies: 11

Views: 4K

Why Does a Balance Regain its Equilibrium Position?

Feb 17, 2011 · Replies 10 · Feb 18, 2011

Replies: 10

Views: 3K

Coriolis explanation for cyclones and anticyclones

Feb 16, 2011 · Replies 9 · Feb 17, 2011

Replies: 9

Views: 5K

Solving ODEs for Velocity & Limiting Velocity

Feb 17, 2011 · Replies 2 · Feb 17, 2011

Replies: 2

Views: 6K

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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