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

High School Mousetrap Car Energy efficiency

Optics

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

Thermodynamics

High School Using battery energy to heat a battery…

Electromagnetism

Undergrad What determines if wave components are independent vs coherent?
Undergrad Does Larmor precession change the force exerted on a magnetic dipole?
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Undergrad Constraint Forces and Lagrange Multipliers
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High School Busting the myth about achieving artificial gravity by rotating a body
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Undergrad Intuition Behind Intermediate Axis Theorem in an Ideal Setting
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Undergrad The physics behind mixing coloured pigments (questions inside post)
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Undergrad Question about Penning Trap
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Undergrad Landau's inertial frame logic
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Undergrad Requirement of Holonomic Constraints for Deriving Lagrange Equations
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Graduate Basic Question about Gauge Transformations
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Undergrad Having trouble understanding Tensor Contraction
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High School Radio waves -- Tissue Refractive Index
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High School Circular wire center of gravity
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Undergrad Question about the velocity of the center of mass reference frame
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Graduate F.E.M and Hamilton's Principle (converting differential equations into integral equations)
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Undergrad Magnetic Flux - Misleading Definition or what?
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Undergrad Does gas flow from low to high pressure?
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Undergrad Mechanics problem: A Weight and a Mass Suspended from a String
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High School How are fractures in airplane structures detected by ultrasound?
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Undergrad Galilean relativity for 2 frames
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High School What are complex numbers good for?
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Undergrad Help to model transmission of forces through a medium
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High School 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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High School Hydrostatic pressure on top of a cone filled with water
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High School [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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Undergrad Calculating Force on a Golf Ball when Putting on a Level Green
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High School Jaan Kalda kinematics -- Radius of Curvature of a Cycloid
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Undergrad What power rating do UV-A Tubes have? (tanning salons)
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Undergrad Balloon experiment - Classical Physics vs. Statistical Physics
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Graduate Electrostatic interaction inside and outside the source
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Undergrad Lagrangian doesn't change when adding total time derivative
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Graduate Confused about multipole expansion of vector potential
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Graduate If the solution of a field vanishes on-shell does it mean anything?
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Undergrad Hydrogen balloon experiment -- How high can it rise?
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Undergrad Does the Hamilton-Jacobi equation exist for chaotic systems?
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High School How does Earth's rotation affect our movement?
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Undergrad Why momentum is conserved when a gun fires? (conceptual question)
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Undergrad Compressed air Pushing a Column of Water
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High School Is the Earth's gravitational pull constant?
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Undergrad Longest day of the year is June 21 but longest daylight is June 26?
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High School Explaining Variations of Free-Fall Gravity on Earth?
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Graduate Can position and velocity vary independently in Hamilton's Principle?
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Undergrad Error on a weighing scale due to wrong size
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Undergrad How Does Landau Justify the Additivity of Lagrangians in Isolated Systems?
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High School Gas diffusion rates for methane into a vacuum versus into nitrogen
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High School Units of S/N ratio in some papers
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Undergrad Using Linear Algebra to discover unknown Forces
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High School Exact differential and work done
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High School Can sunglasses fully protect against UV sensitivity?
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Undergrad Change in Momentum from mass contribution to the moving object
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Undergrad Does mass conservation correspond to a pseudo-symmetry?
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Graduate Why are the Navier-Stokes equations inconsistent in this case?
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High School Can a skateboarder ride faster by holding a water bottle?
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High School How would one draw reflected wavefronts?
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High School Why don't electrons leave a metal surface?
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High School Some questions about humidity and storing DVDs in a closed cardboard box
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Undergrad Bead on a vertical frictionless ring
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Undergrad A pendulum with viscous friction
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Undergrad Mechanism of action of cooling from fans with misters
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Undergrad Find the constant acceleration of an object that slows down to a standstill
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Undergrad Best frequency of radio light to penetrate 1 meter of sea water?
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High School The Sun's Influence on the Moon's Orbit: Is it Negligible?
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High School Looking for help Understanding Inertia
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Undergrad I need some support, please, for a gravity assist analysis
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High School Magnetic bottle is said to store hydrogen (and then convert into helium?)
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High School What is the total kinetic energy of the Earth relative to the Sun?
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Undergrad Wondering how much thrust a drone propeller generates
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Undergrad The Science Behind Rainbows: Explaining the Center of a Rainbow | Gooood Morning
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Undergrad Switching polarizer and analyzer: the order matters -- why?
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Undergrad Confused about applying the Euler–Lagrange equation
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Undergrad Derivation of ideal gas heat capacity relationship
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Research on HV to UHV vacuum gauge and controller build (Amateur scale)
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Graduate Electric field vs coupling between transmission lines
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Undergrad Is Hooke's law really not working, or is it me being dummy?
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High School How is an unstable object balanced?
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Undergrad Is the energy destroyed in this experiment?
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Undergrad Can angular motion exist outside of a gravity field?
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High School If gravity was a force wouldn't going back in time cause us to float?
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High School Any limit on how fast a Maglev can go?
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High School How will object's velocity change when a frictional force increases?
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Undergrad Exit velocity through a nozzle: Bernoulli vs. Experience
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High School Elastic collision - should final velocities be asymmetric?
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High School Force transition through spring
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Undergrad Moving Spacecraft propellent less?
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Undergrad Parallel Capacitor safety at 10 micron plate spacing
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Graduate IR Laser diode focusing and module selection for CSEL Laser pointer
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Undergrad DC current flows in a wire when two loops are brought close by?
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High School Things giving rise to static and dynamic coefficients of friction?
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Graduate What does it mean when the eom of a field is trivially satisfied?
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High School Velocity of freefalling bodies after 1s, 2s, 3s, etc
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Undergrad Drawback of dimensional analysis - motion in a resistive medium
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High School What is meant by "local melting"?
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Undergrad Speed of Two Falling Ladders (Veritasium Video)
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Undergrad Proving that the Lagrangian of a free particle is independent of q
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Undergrad How Is Power Calculated in a Rotating System with Variable Speed?
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High School Maximum velocity for projectile motion?
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Undergrad Prony brake calculation help (for determining engine horsepower)
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Undergrad Fake water spin experiments around the equator
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Undergrad Solving for Angular Velocity After a Disc Collision
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