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    • Mechanics (A)
      • Acceleration (A+0)
      • Conservation of Energy (A+5)
      • Frames of Reference (A+10)
      • Friction (A+12)
      • Forces (A+14)
      • Gravitation (A+15)
      • Linear Inertia (A+20)
      • Rotational Inertia (A+25)
      • Angular Momentum (A+30)
      • Linear Momentum (A+35)
      • Motion in One Dimension (A+37)
      • Physical Measurements (A+45)
      • Projectiles (A+50)
      • Rotational Dynamics (A+55)
      • Statics and Mechanical Equilibrium (A+60)
      • Torque (A+65)
      • Vectors (A+70)
      • Mechanical Advantage (A+80)
    • Waves (B)
      • Chaotic Oscillations (B+5)
      • Simple Harmonic Motion (B+10)
      • Coupled Harmonic Oscillators (B+15)
      • Forced Oscillations/Resonance (B+20)
      • Travelling Waves (B+25)
      • Superposition : Fourier Principles/Complex Waves (B+30)
      • Interference (B+35)
      • Sound Spectrum/Sources (B+45)
      • Standing Waves/Resonance (B+50)
      • Vibrational Modes (B+55)
      • Speed of Sound (B+60)
      • Doppler Shift (B+65)
      • Shock Waves (B+67)
      • Music and the Ear (B+70)
    • Properties of Heat and Matter (C)
      • Weather and the Atmosphere (C+0)
      • Calorimetry (C+5)
      • Carnot Cycle (C+10)
      • Conduction (C+15)
      • Convection (C+20)
      • Engines and Pumps (C+22)
      • Fluid Dynamics (C+25)
      • Surface Tension and Capillary Action (C+27)
      • Fluid Statics (C+30)
      • Heat and Work (C+35)
      • Heat Capacity (C+40)
      • Heat of Fusion (C+45)
      • Irreversibility and Fluctuations (C+50)
      • Kinetic Theory and Gas Models (C+55)
      • Liquification of a Gas (C+60)
      • Molecular Models and Crystal Structure (C+62)
      • Radiation (C+65)
      • Temperature and Expansion (C+70)
      • Thermometry (C+75)
      • Triple Point (C+80)
      • Mechanical Properties of Materials (C+90)
    • Electricity and Magnetism (D)
      • Capacitance (D+0)
      • Electromagnetic Oscillations (D+5)
      • Electrostatics (D+10)
      • Faraday's Law (D+15)
      • Inductance (D+20)
      • LCR Phase Relationships (D+25)
      • Magnetic Fields (D+30)
      • Magnetic Properties (D+35)
      • Meters (D+40)
      • Motors (D+45)
      • Oscilloscopes (D+50)
      • Resistance (D+55)
      • Solid State and Semiconductors (D+60)
      • Thermionic Emission (D+65)
      • Thermoelectricity (D+70)
      • Transformers (D+75)
      • Voltaic Cells (D+80)
      • Electrolysis (D+85)
    • Optics (E)
      • Color Perception (E+5)
      • Diffraction (E+10)
      • Gratings and Spectra (E+15)
      • Holography (E+20)
      • Interference (E+25)
      • Lenses (E+30)
      • Metallic Color (E+35)
      • Mirrors (E+40)
      • Polarization and Birefringence (E+45)
      • Prisms (E+50)
      • Propagation of Light (E+55)
      • Refraction and Reflection (E+60)
      • Spectral Energy (E+65)
    • Modern and Contemporary Physics (F)
      • Cathode and Canal Rays (F+0)
      • X-Rays (F+5)
      • Electron Diffraction (F+10)
      • Photoelectric Effect (F+15)
      • Atomic Structure (F+20)
      • Photons (F+18)
      • Quantum Mechanical Barrier Penetration (F+30)
      • Scattering (F+25)
      • Elementary Particles (F+35)
      • Cloud Chambers (F+45)
      • Range of Alpha Particles (F+50)
      • Franck-Hertz Experiment (F+55)
      • Radioactivity (F+65)
      • Accelerators (F+70)
      • Fission and Fusion (F+80)
      • Superconductivity (F+85)
      • Zeeman Effect (F+90)
      • Laser (F+95)
      • Fuel Cells (F+100)
    • Astronomy and Perception (G)
      • Astronomy Slides (G+0)
      • Astronomy Models (G+5)
      • Optical Illusions (G+55)
      • Audio Illusions (G+50)
      • Perception (G+60)
  • Demonstrations by PIRA index
    • 1 Mechanics
      • 1A Measurement
        • 1A50 Math Topics
        • 1A60 Scaling
      • 1C Motion In One Dimension
        • 1C10 Velocity
        • 1C20 Uniform Acceleration
        • 1C30 Measuring G
      • 1D Motion In Two Dimensions
        • 1D10 Displacement in Two Dimensions
        • 1D15 Velocity, Position, and Acceleration
        • 1D40 Motion of the Center of Mass
        • 1D50 Central Forces
        • 1D52 Deformation by Central Forces
        • 1D55 Centrifugal Escape
        • 1D60 Projectile Motion
      • 1E Relative Motion
        • 1E10 Moving Reference Frames
        • 1E20 Rotating Reference Frames
        • 1E30 Coriolis Effect
      • 1F Newton's First Law
        • 1F10 Measuring Inertia
        • 1F20 Inertia of Rest
        • 1F30 Inertia of Motion
      • 1G Newton's Second Law
        • 1G10 Force, Mass, and Acceleration
        • 1G20 Accelerated Reference Frames
        • 1G30 Complex Systems
      • 1H Newton's Third Law
        • 1H10 Action and Reaction
        • 1H11 Recoil
      • 1J Statics Of Rigid Bodies
        • 1J10 Finding Center of Gravity
        • 1J11 Exceeding Center of Gravity
        • 1J20 Stable, Unstable and Neutral Equilibrium
        • 1J30 Resolution of Forces
        • 1J40 Static Torque
      • 1K Applications Of Newton's Laws
        • 1K10 Dynamic Torque
        • 1K20 Friction
        • 1K30 Pressure
      • 1L Gravity
        • 1L10 Universal Gravitational Constant
        • 1L20 Orbits
      • 1M Work And Energy
        • 1M10 Work
        • 1M20 Simple Machines
        • 1M30 Non-Conservative Forces
        • 1M40 Conservation of Energy
        • 1M50 Mechanical Power
      • 1N Linear Momentum And Collisions
        • 1N10 Impulse and Thrust
        • 1N20 Conservation of Linear Momentum
        • 1N21 Mass and Momentum Transfer
        • 1N22 Rockets
        • 1N30 Collisions in One Dimension
        • 1N40 Collisions in Two Dimensions
      • 1Q Rotational Dynamics
        • 1Q10 Moment of Inertia
        • 1Q20 Rotational Energy
        • 1Q30 Transfer of Angular Momentum
        • 1Q40 Conservation of Angular Momentum
        • 1Q50 Gyros
        • 1Q60 Rotational Stability
      • 1R Properties Of Matter
        • 1R10 Hooke's Law
        • 1R20 Tensile and Compressive Stress
        • 1R30 Shear Stress
        • 1R40 Coefficient of Restitution
        • 1R50 Crystal Structure
    • 3 Oscillations and Waves
      • 3A Oscillations
        • 3A10 Pendula
        • 3A20 Springs & Oscillators
        • 3A15 Physical Pendula
        • 3A40 Simple Harmonic Motion
        • 3A50 Damped Oscillators
        • 3A60 Driven Mechanical Resonance
        • 3A70 Coupled Oscillations
        • 3A75 Normal Modes
        • 3A80 Lissajous Figures
        • 3A95 Non-Linear Systems
      • 3B Wave Motion
        • 3B10 Transverse Pulses and Waves
        • 3B20 Longitudinal Pulses and Waves
        • 3B22 Standing Waves
        • 3B25 Impedence and Dispersion
        • 3B27 Compound Waves
        • 3B30 Wave Properties of Sound
        • 3B33 Phase and Group Velocity
        • 3B35 Reflection & Refraction (Sound)
        • 3B39 Transfer of Energy in Waves
        • 3B40 Doppler Effect
        • 3B45 Shock Waves
        • 3B50 Interference and Diffraction
        • 3B55 Interference and Diffraction Of Sound
        • 3B60 Beats
        • 3B70 Coupled Resonators
      • 3C Acoustics
        • 3C10 The Ear
        • 3C20 Pitch
        • 3C30 Intensity and Attenuation
        • 3C40 Architectural Acoustics
        • 3C50 Wave Analysis and Synthesis
        • 3C55 Music Perception and the Voice
      • 3D Instruments
        • 3D20 Resonance in Strings
        • 3D22 Stringed Instruments
        • 3D30 Resonance Cavities
        • 3D32 Air Column Instruments
        • 3D40 Resonance in Plates, Bars, Solids
        • 3D46 Tuning Forks
        • 3D50 Electronic Instruments
      • 3E Sound Reproduction
        • 3E10 Audio System
        • 3E20 Loudspeakers
        • 3E30 Microphones
        • 3E40 Amplifiers
        • 3E60 Recorders
        • 3E80 Digital System
    • 4 Thermodynamics
      • 4A Thermal Properties Of Matter
        • 4A10 Thermometry
        • 4A20 Liquid Expansion
        • 4A30 Solid Expansion
        • 4A40 Properties of Materials at Low Temperature
        • 4A50 Liquid Helium
      • 4B Heat And The First Law
        • 4B10 Heat Capacity and Specific Heat
        • 4B20 Convection
        • 4B30 Conduction
        • 4B40 Radiation
        • 4B50 Heat Transfer Applications
        • 4B60 Mechanical Equivalent of Heat
        • 4B70 Adiabatic Processes
      • 4C Change Of State
        • 4C10 PVT Surfaces
        • 4C20 Phase Changes: Liquid-Solid
        • 4C30 Phase Changes: Liquid-Gas
        • 4C31 Cooling by Evaporation
        • 4C32 Dew Point and Humidity
        • 4C33 Vapor Pressure
        • 4C40 Sublimation
        • 4C45 Phase Changes: Solid Solid
        • 4C50 Critical Point
      • 4D Kinetic Theory
        • 4D10 Brownian Motion
        • 4D20 Mean Free Path
        • 4D30 Kinetic Motion
        • 4D40 Molecular Dimensions
        • 4D50 Diffusion & Osmosis
      • 4E Gas Law
        • 4E10 Constant Pressure
        • 4E20 Constant Temperature
        • 4E30 Constant Volume
      • 4F Entropy And The Second Law
        • 4F10 Entropy
        • 4F30 Heat Cycles
    • 5 Electricity and Magnetism
      • 5A Electrostatics
        • 5A10 Producing Static Charge
        • 5A20 Coulomb's Law
        • 5A22 Electrostatic Meters
        • 5A30 Conductors and Insulators
        • 5A40 Induced Charge
        • 5A50 Electrostatic Machines
      • 5B Electric Fields And Potential
        • 5B10 Electric Field
        • 5B20 Gauss' Law
        • 5B30 Electrostatic Potential
      • 5C Capacitance
        • 5C10 Capacitors
        • 5C20 Dielectric
        • 5C30 Energy Stored in a Capacitor
      • 5D Resistance
        • 5D10 Resistance Characteristics
        • 5D20 Resistivity and Temperature
        • 5D30 Conduction in Solutions
        • 5D40 Conduction in Gases
      • 5E Electromotive Force And Current
        • 5E20 Electrolysis
        • 5E30 Plating
        • 5E40 Cells and Batteries
        • 5E50 Thermoelectricity
        • 5E60 Piezoelectricity
      • 5F DC Circuits
        • 5F10 Ohm's Law
        • 5F15 Power and Energy
        • 5F20 Circuit Analysis
        • 5F30 RC Circuits
        • 5F40 Instruments
      • 5G Magnetic Materials
        • 5G10 Magnets
        • 5G20 Magnet Domains & Magnetization
        • 5G30 Paramagnetism and Diamagnetism
        • 5G40 Hysteresis
        • 5G45 Magnetostriction and Magnetoresistance
        • 5G50 Temperature and Magnetism
      • 5H Magnetic Fields And Forces
        • 5H10 Magnetic Fields
        • 5H15 Fields and Currents
        • 5H20 Forces on Magnets
        • 5H25 Magnet/Electromagnet Interactions
        • 5H30 Force on Moving Charges
        • 5H40 Force on Current in Wires
        • 5H50 Torques on Coils
      • 5J Inductance
        • 5J10 Self Inductance
        • 5J20 LR Circuits
        • 5J30 RLC Circuits DC
      • 5K Electromagnetic Induction
        • 5K10 Induced Currents and Forces
        • 5K20 Eddy Currents
        • 5K30 Transformers
        • 5K40 Motors and Generators
      • 5L AC Circuits
        • 5L10 Impedance
        • 5L20 LCR Circuits AC
        • 5L30 Filters and Rectifiers
      • 5M Semiconductors And Tubes
        • 5M10 Semiconductors
        • 5M20 Tubes
      • 5N Electromagnetic Radiation
        • 5N10 Transmission Lines and Antennas
        • 5N20 Tesla Coil
        • 5N30 Electromagnetic Spectrum
    • 6 Optics
      • 6A Geometrical Optics
        • 6A01 Speed of Light
        • 6A02 Straight Line Propagation
        • 6A10 Reflection From Flat Surfaces
        • 6A20 Reflection from Curved Surfaces
        • 6A40 Refractive Index
        • 6A42 Refraction at Flat Surfaces
        • 6A44 Total Internal Reflection
        • 6A46 Rainbow
        • 6A60 Thin Lens
        • 6A61 Pinhole
        • 6A65 Thick Lens
        • 6A70 Optical Instruments
      • 6B Photometry
        • 6B10 Luminosity
        • 6B30 Radation Pressure
        • 6B40 Blackbodies
      • 6C Diffraction
        • 6C10 Diffraction Through One Slit
        • 6C20 Diffraction Around Objects
      • 6D Interference
        • 6D10 Interference From Two Sources
        • 6D15 Interference of Polarized Light
        • 6D20 Gratings
        • 6D30 Thin Films
        • 6D40 Interferometers
      • 6F Color
        • 6F10 Synthesis and Analysis of Color
        • 6F30 Dispersion
        • 6F40 Scattering
      • 6H Polarization
        • 6H10 Dichroic Polarization
        • 6H20 Polarization by Reflection
        • 6H30 Circular Polarization
        • 6H35 Birefringence
        • 6H50 Polarization by Scattering
      • 6J The Eye
        • 6J10 The Eye
        • 6J11 Physiology
      • 6Q Modern Optics
        • 6Q10 Holography
        • 6Q20 Physical Optics
    • 7 Modern Physics
      • 7A Quantum Effects
        • 7A10 Photoelectric Effect
        • 7A15 Millikan Oil Drop
        • 7A20 Compton Effect
        • 7A50 Wave Mechanics
        • 7A55 Particle/Wave Duality
        • 7A60 X-ray and Electron Diffraction
        • 7A70 Condensed Matter
      • 7B Atomic Physics
        • 7B10 Spectra
        • 7B11 Absorption
        • 7B13 Resonance Radiation
        • 7B20 Fine splitting
        • 7B30 Ionization Potential
        • 7B35 Electron Properties
        • 7B50 Atomic Models
      • 7D Nuclear Physics
        • 7D10 Radioactivity
        • 7D20 Nuclear Reactions
        • 7D30 Particle Detectors
        • 7D40 Nuclear Magnetic Resonance (NMR)
        • 7D50 Models of the Nucleus
      • 7E Elementary Particles
        • 7E10 Miscellaneous
      • 7F Relativity
        • 7F10 Special Relativity
        • 7F20 General Relativity
    • 8 Astronomy
      • 8A Planetary Astronomy
        • 8A05 Historical Astronomy
        • 8A10 Solar System Mechanics
        • 8A20 Earth Moon Mechanics
        • 8A30 Views From Earth
        • 8A35 Views From Earth 2
        • 8A40 Planetary Properties: Globes, Hemispheres, & Maps
        • 8A50 Planetary Properties 2: The Planets
        • 8A60 Planetary Properties 3: Planetoids, Minor Objects
        • 8A70 Planetary Properties 4: Planetary Characteristics
        • 8A80 Planetary Properties 5: Comets And The Search For Life
      • 8B Stellar Astronomy
        • 8B10 The Sun
        • 8B20 Stellar Spectra
        • 8B30 Stellar Evolution
        • 8B40 Black Holes
        • 8B50 Stellar Miscellaneous
      • 8C Cosmology
        • 8C10 Models of The Universe
        • 8C20 Gravitational Effects
      • 8D Miscellaneous
        • 8D10 Miscellaneous Astronomy
      • 8E Astronomy Teaching Techniques
        • 8E30 Techniques and Projects
    • 9 Equipment
      • 9A Support Systems / Facility
        • 9A10 Blackboard Tools
        • 9A20 Audio
        • 9A30 Slide Projectors
        • 9A34 Film Projectors
        • 9A36 Overhead Projectors
        • 9A38 Video & Computer Projection
        • 9A40 Photography
        • 9A50 X-Y, Chart Recorders
        • 9A60 Buildings
        • 9A65 Museums
        • 9A70 Resource Books
        • 9A73 Unclassified Demonstrations
        • 9A75 Philosophy
        • 9A80 Films
        • 9A85 Computer Programs
      • 9B Electronic
        • 9B10 Timers
        • 9B15 Position and Velocity Detectors
        • 9B17 Sources of Sound
        • 9B18 Sound Detectors
        • 9B20 Circuits/Components/Instruments
        • 9B30 Function Generators
        • 9B37 Oscilloscopes
        • 9B40 Advanced Instruments
        • 9B50 Power Supplies
        • 9B60 Light Sources
        • 9B61 Light Paths Made Visible
        • 9B62 Lasers
        • 9B65 Microwave Apparatus
        • 9B90 Computer Interface
      • 9C Mechanical
        • 9C10 Motors
        • 9C20 Pumps
        • 9C25 Vacuum
        • 9C30 Air Support
        • 9C35 Ripple Tank
        • 9C40 Other
    • 2 Fluid Mechanics
      • 2A Surface Tension
        • 2A10 Force of Surface Tension
        • 2A15 Minimal Surface
        • 2A20 Capillary Action
        • 2A30 Surface Tension Propulsion
      • 2C Dynamics Of Fluids
        • 2C10 Flow Rate
        • 2C20 Forces in Moving Fluids
        • 2C30 Viscosity
        • 2C40 Turbulent and Streamline Flow
        • 2C50 Vorticies
        • 2C60 Non Newtonian Fluids
      • 2B Statics Of Fluids
        • 2B20 Static Pressure
        • 2B30 Atmospheric Pressure
        • 2B35 Measuring Pressure
        • 2B40 Density and Buoyancy
        • 2B60 Siphons, Fountains, Pumps
        • 2B20.10

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  1. Two balls hung on the same string, one in middle, one at the end. added to demo request on 12-11-2013
  2. Two balls hung on the same string, one in middle, one at the end. added to demo request on 19-11-2014
  3. 5 Metronomes on board and cans sync their oscillations
  4. List of Undergraduate Demos
  5. Demos Grad Students can Check Out
  6. Two balls hung on the same string, one in middle, one at the end. added to demo request on 18-11-2015
  7. Two balls hung on the same string, one in middle, one at the end. added to demo request on 22-11-2016
  8. Two balls hung on the same string, one in middle, one at the end. added to demo request on 09-04-2018
  9. Two balls hung on the same string, one in middle, one at the end. added to demo request on 09-04-2024
  10. Two balls hung on the same string, one in middle, one at the end. added to demo request on 11-04-2024