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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.

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Mechanics

Observation about the rotation of a disc
27.6K threads
Graduate Observation about the rotation of a disc

Optics

Question about computing diffraction patterns
8.2K threads
High School Question about computing diffraction patterns

Thermodynamics

Musing on the Foundations of Statistical Mechanics
7.4K threads
Graduate Musing on the Foundations of Statistical Mechanics

Electromagnetism

A magnetostatics problem of interest 2
16.3K threads
Graduate A magnetostatics problem of interest 2
Graduate Is the maximum of a function in 3 space a constant?
  • yungman
  • · Replies 2 ·
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2
Undergrad Relationship Between Mass, Tension & Length in a Vibrating String
  • bugler777
  • · Replies 13 ·
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13
High School Whats the difference between progressive wave and stationary waves ?
  • Nidzz93
  • · Replies 43 ·
2
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43
Undergrad Wave Propagation: Experiences Beyond Equilibrium Position
  • scoutfai
  • · Replies 12 ·
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12
Undergrad Wave vs Waves: Understanding the Difference in Continuous Disturbances
  • spaghetti3451
  • · Replies 7 ·
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7
Graduate What is the Approximation for Retarded Time?
  • noamriemer
  • · Replies 2 ·
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2
Graduate Optimal Performance of a Water Molecule Vessel in Ocean Conditions
  • aussie101
  • · Replies 8 ·
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8
High School What Causes Gravity? Insulation & Density Explained
  • Pocketwatch2
  • · Replies 3 ·
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3
Undergrad I once came across a Wikipedia page describing a system where
  • Apteronotus
  • · Replies 2 ·
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2
High School What is Shear in Materials Science?
  • austincb90
  • · Replies 1 ·
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1
High School How 2 Notes Combine on Piano Keyboard
  • pkc111
  • · Replies 39 ·
2
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39
Graduate Scientists Discuss Mysteries of Vacuums
  • darkchild
  • · Replies 4 ·
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4
High School Does close systems really exist?
  • nouveau_riche
  • · Replies 17 ·
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17
High School Learn About Harmonic Oscillator - Beginner Physics Guide
  • Erbil
  • · Replies 2 ·
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2
Graduate Solve World Physics Olympiad (WOPHO) Problems Together
  • umciukas
  • · Replies 9 ·
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9
Undergrad Where is the Phase Diagram for X and XDot?
  • dirac1902
  • · Replies 2 ·
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2
High School Why Do Many Physical Phenomena Exhibit Wave Behavior?
  • garfield1729
  • · Replies 37 ·
2
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37
Undergrad Inverse square law and infinite intensity
  • fluidistic
  • · Replies 5 ·
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5
Undergrad Which shock is dangerous: 1.High V &Low I. 2.Low V & high I.
  • waqarrashid33
  • · Replies 24 ·
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24
Graduate Self-Diffusion, two versions of mean square displacement
  • Derivator
  • · Replies 1 ·
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1
Undergrad Why is force inversely proportional to distance?
  • l-1j-cho
  • · Replies 10 ·
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10
High School Using only intuition, about a locked thread
  • fluidistic
  • · Replies 21 ·
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21
Graduate Solving the Wave Equation with Method of Characteristics
  • marioooo
  • · Replies 12 ·
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12
High School Syphoning Effect: Is It Possible?
  • antekatavic
  • · Replies 66 ·
3
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66
Graduate Mass Air Bubble: Negative Effects in Material Medium
  • Himal kharel
  • · Replies 3 ·
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3
Inflating Tyres: Is it Possible to Make Them Lighter?
  • Himal kharel
  • · Replies 4 ·
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4
Undergrad How do I derive viscosity equation
  • jubaaa
  • · Replies 3 ·
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3
High School Understanding Fluids: The Weight of Steel Balls in Alcohol and Oil
  • naicidrac
  • · Replies 14 ·
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14
Graduate Connection between precession and resonance frequencies?
  • Roo2
  • · Replies 2 ·
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2
Graduate Physical explanation of Kronig-Kramers application
  • singhvi
  • · Replies 2 ·
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2
Undergrad Can you harvest a sails energy withouth movement?
  • dboy18
  • · Replies 2 ·
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2
Undergrad Why doesn't resonance result in infinite energy transfer?
  • ckuze
  • · Replies 13 ·
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13
Graduate Which is the proper formula for mag-monopoles attraction?
  • jumpjack
  • · Replies 3 ·
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3
Graduate Mean free path in units g/cm^2
  • go quantum!
  • · Replies 1 ·
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1
High School Which Formulas have this format?
  • [V]
  • · Replies 3 ·
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3
Undergrad Centrifugal Pumps & Blowers: Why Prime Pumps not Blowers?
  • anshul144
  • · Replies 8 ·
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8
Undergrad Understanding Degrees of Freedom in Calculating Molecule Kinetic Energy
  • elabed haidar
  • · Replies 8 ·
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8
Undergrad What are the toughest physics exercise books?
  • fgyamauti
  • · Replies 1 ·
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1
Undergrad How does energy transmission work in waves?
  • Owen-
  • · Replies 4 ·
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4
Undergrad How does analog video acquisition work?
  • splitringtail
  • · Replies 4 ·
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4
High School Understanding the Concept: Unchangeable Models
  • Kongys
  • · Replies 2 ·
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2
High School Why Don't Waves Freeze in Water?
  • CarbonWater
  • · Replies 16 ·
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16
Undergrad What Are the Physics Behind Exponential Horns and Air Expansion?
  • HengHY
  • · Replies 1 ·
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1
Undergrad Brass Instruments: Why Bells Allow Efficient Energy Transfer
  • michaelp7
  • · Replies 8 ·
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8
Undergrad Why is the energy not conserved when adding waves?
  • Daker
  • · Replies 3 ·
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3
Undergrad Help with understanding resonance
  • Anonymstudent
  • · Replies 2 ·
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2
High School Which Liquid Lubricant Replaces Grease for Bicycle Chains?
  • Arjun Ar
  • · Replies 9 ·
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9
Undergrad Identifying Spectra: Comparing Closest Matches for Unknown Spectra
  • Fjolvar
  • · Replies 1 ·
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1
Undergrad Wave equation derivation Why is the angle assumed to be small?
  • McLaren Rulez
  • · Replies 2 ·
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2
High School How do opaque objects have colour?
  • TheJoninator
  • · Replies 2 ·
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2
Graduate Where did the terms \overline{E \overline{P}} - \overline{\overline{E} P} go?
  • Radiohannah
  • · Replies 2 ·
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2
Graduate Exploring Subsonic, Compressible Flow in Curved Ducts
  • komega
  • · Replies 2 ·
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2
Undergrad How can I calculate the angle of tilt for moon phase at my location?
  • snorkeler
  • · Replies 1 ·
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1
Undergrad Physics of a chemistry experiment
  • Fewmet
  • · Replies 4 ·
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4
Undergrad Shutting down the sprinkler system
  • Tregg Smith
  • · Replies 5 ·
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5
Graduate How Does Rubidium Iodide Electrolyte Affect Pseudocapacitor Energy Density?
  • Stanley514
  • · Replies 2 ·
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2
High School Type of mechanism is mounted on the living room?
  • jaquecusto
  • · Replies 5 ·
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5
Undergrad Was Feynman right about energy?
  • Pengo
  • · Replies 9 ·
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9
Graduate Solving Forced Wave Equation with Causal Boundary Conditions
  • nickthequick
  • · Replies 3 ·
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3
Undergrad Does the Cheerio Effect Occur in Zero-Gravity?
  • GRB 080319B
  • · Replies 2 ·
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2
Graduate Deriving 1D Wave Equation for Vibrating Guitar String
  • deadstar33
  • · Replies 5 ·
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5
Undergrad How Do Spinning Tops and Suspended Magnets Exhibit Surprising Physics?
  • deepthishan
  • · Replies 4 ·
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4
Undergrad Hi i'm an applied maths student i'd like to study about catenary
  • princy
  • · Replies 2 ·
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2
High School Are Tiles Non-Conductors? Earth Safety in Physics Lab
  • waqarrashid33
  • · Replies 6 ·
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6
High School LEDs for Growing Indoor Plants: Efficient Luminous Efficacy
  • arch3r
  • · Replies 1 ·
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1
Undergrad Differential and derivatives [HELP]
  • xmedium
  • · Replies 4 ·
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4
Undergrad How Should Wind Turbine Blades Be Designed for Maximum Efficiency?
  • lukedimarco
  • · Replies 3 ·
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3
High School Why Do Feet Sink in Sand on Beaches?
  • abhiroop_k
  • · Replies 2 ·
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2
Undergrad Correct exaggerated drawing of tides
  • twain
  • · Replies 7 ·
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7
Graduate Simplified diffusion-convection model w/ Rayleigh-Taylor unstability
  • TboneWalker
  • · Replies 2 ·
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2
Undergrad Revolutionizing Coast Guarding with Buoyant Capsule Technology
  • Raama
  • · Replies 9 ·
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9
Undergrad Gravitation law equation as R approaches zero
  • pconstantino
  • · Replies 4 ·
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4
High School Can You Create a Smoke Ring Using Only Air in Cold Weather?
  • kompabt
  • · Replies 1 ·
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1
Undergrad Given g and T, find volume & mass of atmosphere
  • brainfuel
  • · Replies 5 ·
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5
High School Why positive or negtive pole of battery can not attract small objects ?
  • magnetar
  • · Replies 23 ·
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23
High School What are some award-winning, easy, and cheap science fair project ideas?
  • kashyapdatta
  • · Replies 1 ·
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1
Graduate Order parameter, correlation function and length
  • TheDestroyer
  • · Replies 3 ·
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3
Undergrad What happens to energy in standing waves?
  • Shing
  • · Replies 21 ·
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21
Dipole Moment (D): Definition & Explanation
  • study.bug
  • · Replies 1 ·
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1
High School Is there some sort of state of matter between a liquid and a gas?
  • partialfracti
  • · Replies 3 ·
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3
Undergrad Finding Polar & Azimuthal Angles of 3D Vector
  • susantha
  • · Replies 3 ·
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3
High School Comparing Energy Expenditure: Treadmill vs Outdoor Running
  • teodorakis
  • · Replies 13 ·
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13
Undergrad Low absorption , high absorption
  • Vor
  • · Replies 2 ·
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2
High School Innovative Ideas for Teaching Tires & Physics to my Class
  • sharming14
  • · Replies 14 ·
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14
Graduate Lorrain & Corson: Help with Derivation of Fig 18.9/7.20
  • classy cal
  • · Replies 2 ·
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2
Graduate Wave Theory Questions & Answers
  • pinsky
  • · Replies 1 ·
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1
High School Doppler Effect from Physics 101
  • Ut-Napishtim
  • · Replies 1 ·
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1
Undergrad How Can Amplitude Decay be Modeled with a Pendulum and Friction Coefficient?
  • satori20
  • · Replies 1 ·
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1
High School Debunking the Myth: Does 1 Cubic Meter of Air Really Weigh 1kg?
  • quantum123
  • · Replies 7 ·
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7
Graduate Modeling climate with rigid bodies
  • dwnielsen
  • · Replies 2 ·
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2
Undergrad Why Do Equations for Doppler Effect Differ for Moving Source and Observer?
  • Terocamo
  • · Replies 5 ·
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5
High School How Do Significant Figures Reflect Measurement Uncertainty?
  • balboa
  • · Replies 7 ·
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7
High School Zoom in is equivalent to move forward?
  • zli034
  • · Replies 4 ·
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4
High School What is the location of Patm=0kpa?
  • aiklone1314
  • · Replies 2 ·
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2
Graduate What is the boundary condition for a moving solid boundary in a viscous fluid?
  • n9e9o9
  • · Replies 4 ·
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4
Graduate What causes the stability and formation of smoke rings and air rings in water?
  • jumpjack
  • · Replies 4 ·
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4
Undergrad Convert 55lb-65lb Draw Weight to 1/2kx^2
  • logaliciouz
  • · Replies 2 ·
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2
High School FM vs AM Broadcast: Advantages & Disadvantages
  • chocofingers
  • · Replies 17 ·
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17
High School What Is a Deformable System in Physics?
  • serway
  • · Replies 1 ·
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1
Graduate Energy-Standing and Travelling waves
  • emailanmol
  • · Replies 10 ·
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10