Next step
Open the first concept fast
Use one strong concept page first, then widen out from read-next, topic cues, and local progress.
Open SHMConcept library
Find a concept fast, then move straight into the live page.
The catalog, topic routes, starter tracks, and local-progress cues all come from the canonical concept system. The first screen now prioritizes immediate entry and the real browser instead of stacked library-intro panels.
Start here
Pick one concept, use the real controls, and keep the graph close.
If you are new here, one strong concept page is still the fastest first pass. If you want more structure, use starter tracks or the challenge hub without leaving the shared concept-page framework.
Good first modules
Simple Harmonic Motion25 min
See one repeating system from displacement to acceleration and back again, with the math tied directly to the motion on screen.
Projectile Motion25 min
Launch a projectile, watch the trajectory form, and connect the range, height, and component motion to the launch settings.
Temperature and Internal Energy30 min
Compare average particle motion with whole-sample energy, vary amount and heating, and see why a phase-change shelf breaks naive temperature-only reasoning on one compact thermal bench.
Starter track
Gravity and Orbits
Start with one source mass creating a field and potential well, then use that same gravity model to explain circular speed, orbital periods, and the escape threshold.
Start Gravity and Orbits62 modules
Published now and pulled from the canonical concept catalog.
9 topics
Current filters follow the registry order: Oscillations, Resonance, Mechanics, Fluids, Thermodynamics, Electricity, Optics, Electromagnetism, Modern Physics.
12 starter tracks
Curated from the same canonical catalog so the library has guided entry points.
1700 minutes
Approximate total guided study time across the current public-preview catalog.
Guided path
Gravity and Orbits
5 connected concepts when you want sequence instead of a cold library scan.
Start Gravity and OrbitsChallenge path
Use tasks when the next move should be more specific.
The challenge hub surfaces existing authored challenges by topic, concept, and starter-track path without introducing a separate curriculum layer.
Open challenge hubGuided collections
Use lesson sets when the next move should combine tracks, concepts, and challenge entry points.
3 compact collections already reuse the same canonical pages and progress seams. They stay small on purpose so the library does not turn into a second curriculum system.
Lesson set4 steps9 concepts64 min
Waves Evidence Loop
Use one topic route, one starter track, and one focused challenge so the wave story stays bounded for a teacher-led lesson block.
Collection shape
Reuses 1 starter track, 1 challenge step, and 2 supporting surfaces without creating a second curriculum system.
Topic orientationWave starter trackInterference challenge
Lesson set6 steps6 concepts103 min
Electricity Bridge Lesson Set
Move from field cause to voltage to the first full electricity track without leaving the current concept, topic, and challenge surfaces.
Collection shape
Reuses 1 starter track, 1 challenge step, and 2 supporting surfaces without creating a second curriculum system.
Field causeVoltage bridgeElectricity track
Playlist5 steps11 concepts74 min
Electricity to Magnetism Bridge
Use the existing electricity recap, magnetic starter track, and Maxwell capstone surfaces to move into electromagnetism without turning the branch into a full LMS sequence.
Collection shape
Reuses 1 starter track, 1 challenge step, and 2 supporting surfaces without creating a second curriculum system.
Electricity recapMagnetic starter trackInduction checkpoint
Good first concept
Simple Harmonic Motion
Strong first module for getting into the public preview without committing to a full track.
Start SHMGuided path
Gravity and Orbits
Start with one source mass creating a field and potential well, then use that same gravity model to explain circular speed, orbital periods, and the escape threshold.
Start Gravity and OrbitsConcept library
Search fast, then keep the main results in view.
Registry order stays intact, so the fastest scan still starts in the main results.
62 results of 62
Workspace cues
Use search, topic, and progress first. Open extra track filters only when you want a narrower path view.
Type to narrow the library by concept name, topic, starter track, difficulty, tag, or highlight.
Topic
Progress
More filtersStarter-track lens and extra narrowing
OscillationsGood first moduleIntro25 minNot startedMastery: New
Simple Harmonic Motion
See one repeating system from displacement to acceleration and back again, with the math tied directly to the motion on screen.
Foundations
Oscillations and Energy - 1/3Waves - 1/9
AmplitudePhase
Strong first module for getting into the public preview.
Open conceptOscillationsIntro25 minNot startedMastery: New
Oscillation Energy
Watch kinetic and potential energy trade places in simple harmonic motion while the total stays fixed by amplitude and spring stiffness.
Energy in SHM
Oscillations and Energy - 2/3
Kinetic energyPotential energy
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntro25 minNot startedMastery: New
Wave Speed and Wavelength
Follow one traveling wave across the same medium and connect crest spacing, travel delay, source timing, and the relation v = f lambda on one honest live stage.
Wave timing and spacing
Waves - 2/9
v = f lambdaTravel delay
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntro25 minNot startedMastery: New
Sound Waves and Longitudinal Motion
See sound as a longitudinal wave by keeping parcel motion, compression and rarefaction, probe timing, and energy transfer tied to one compact medium-first bench.
Sound in a medium
Waves - 3/9Sound and Acoustics - 1/5
Compression and rarefactionParticle vs wave motion
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntro20 minNot startedMastery: New
Pitch, Frequency, and Loudness / Intensity
Keep one compact sound bench while separating pitch from frequency, loudness from amplitude and an amplitude-squared intensity cue, and probe delay from the source sound itself.
Sound character
Waves - 4/9Sound and Acoustics - 2/5
Pitch from frequencyLoudness from amplitude
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntro20 minNot startedMastery: New
Beats
Superpose two nearby sound frequencies, watch the fast carrier sit inside a slower envelope, and connect beat rate to the frequency difference on one compact bench.
Sound superposition
Waves - 5/9Sound and Acoustics - 3/5
Amplitude envelopeBeat frequency
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntermediate25 minNot startedMastery: New
Doppler Effect
Watch a moving sound source compress wavefronts ahead and stretch them behind, then see how source motion and observer motion combine to change the heard pitch on one bounded classical bench.
Sound with motion
Waves - 6/9Sound and Acoustics - 4/5
Compressed wavefrontsMoving observer
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntermediate30 minNot startedMastery: New
Wave Interference
Superpose two coherent sources, trace their path difference to phase difference, and watch bright and dark regions emerge on the same live screen.
Wave superposition
Waves - 7/9
Constructive interferenceDestructive interference
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntermediate30 minNot startedMastery: New
Standing Waves
Track fixed nodes, moving antinodes, and harmonic mode shapes on one live string while the same probe trace shows the underlying oscillation in time.
Standing-wave patterns
Waves - 8/9
NodesAntinodes
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntermediate30 minNot startedMastery: New
Resonance in Air Columns / Open and Closed Pipes
Compare open and closed pipe boundary conditions on one compact air column so standing-wave shapes, missing even harmonics, probe motion, and pressure cues stay tied to the same resonance state.
Air-column resonance
Waves - 9/9Sound and Acoustics - 5/5
Open vs closed endsOdd-only closed harmonics
Built for quick scanning, filtering, and direct access.
Open conceptOscillationsIntro25 minNot startedMastery: New
Uniform Circular Motion
Track a particle moving at constant speed around a circle and connect radius, angular speed, tangential speed, centripetal acceleration, and the inward-force requirement to the same live state.
Circular model
Motion and Circular Motion - 3/3
RadiusTangential velocity
Built for quick scanning, filtering, and direct access.
Open conceptResonanceIntermediate30 minNot startedMastery: New
Damping / Resonance
Explore how damping removes energy, how driving frequency changes amplitude, and why resonance becomes dramatic near the natural frequency.
Driven response
Oscillations and Energy - 3/3
Drive frequencyAmplitude response
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro25 minNot startedMastery: New
Vectors and Components
Rotate and scale a live vector, decompose it into horizontal and vertical parts, and watch those components drive the same straight-line motion and geometry.
Vector foundations
Motion and Circular Motion - 1/3
MagnitudeAngle
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro25 minNot startedMastery: New
Torque
Push on one pivoted bar and see how lever arm distance, force direction, and turning effect stay tied to the same compact rotational bench.
Turning effects of force
Rotational Mechanics - 1/5
Lever armForce direction
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro25 minNot startedMastery: New
Static Equilibrium / Centre of Mass
Shift one support region under one loaded plank and see how centre of mass, support reactions, and torque balance decide whether the object stays stable or tips.
Balance, support, and centre of mass
Rotational Mechanics - 2/5
Centre of massSupport region
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro25 minNot startedMastery: New
Rotational Inertia / Moment of Inertia
Keep the same total mass and torque, then slide equal masses inward or outward to see why moment of inertia makes some rotors much harder to spin up than others.
Mass distribution and rotational response
Rotational Mechanics - 3/5
Mass radiusMoment of inertia
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntermediate30 minNot startedMastery: New
Rolling Motion
Roll a sphere, cylinder, hoop, or custom mass distribution down one incline and see how rolling without slipping ties translation, rotation, and rotational inertia to the same honest run.
Rolling without slipping
Rotational Mechanics - 4/5
No-slip linkInertia factor
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntermediate25 minNot startedMastery: New
Angular Momentum
Treat angular momentum as rotational momentum on one compact rotor where mass radius and spin rate stay tied to the same readouts, response maps, and same-L conservation story.
Rotational momentum and conservation
Rotational Mechanics - 5/5
L = I omegaSame L, different spin
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro25 minNot startedMastery: New
Momentum and Impulse
Push one cart with a timed force pulse and watch momentum, impulse, and force-time area stay tied to the same motion, readouts, and graphs.
Momentum and force over time
p = mvJ = F delta t
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro30 minNot startedMastery: New
Conservation of Momentum
Watch two carts trade momentum through one bounded internal interaction and see the total stay fixed while the individual momenta, velocities, and center-of-mass motion update together.
Multi-object interactions
Isolated systemsTotal momentum
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro30 minNot startedMastery: New
Collisions
Collide two carts on one honest track, keep total momentum in view, and see how elasticity, mass, and incoming speed shape the rebound or stick-together outcome.
Collisions and restitution
Momentum conservationElastic vs inelastic
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsGood first moduleIntro25 minNot startedMastery: New
Projectile Motion
Launch a projectile, watch the trajectory form, and connect the range, height, and component motion to the launch settings.
Two-dimensional motion
Motion and Circular Motion - 2/3
Launch angleGravity
Strong first module for getting into the public preview.
Open conceptMechanicsIntro25 minNot startedMastery: New
Gravitational Fields
See how one source mass creates an inward gravitational field, how source mass and distance set the field strength, and how a probe mass turns that field into force without changing the field itself.
Gravity and orbit bridges
Gravity and Orbits - 1/5
Field directionInverse-square drop
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntro25 minNot startedMastery: New
Gravitational Potential and Potential Energy
See one source mass create a negative potential well, compare how potential and potential energy change with distance, and connect the downhill slope of phi to the gravitational field on the same live model.
Gravity and orbit bridges
Gravity and Orbits - 2/5
Negative potential wellsU = m phi
Built for quick scanning, filtering, and direct access.
Open conceptFluidsIntro30 minNot startedMastery: New
Pressure and Hydrostatic Pressure
Use one piston-and-tank bench to connect force per area, pressure acting in all directions, and the way density, gravity, and depth build hydrostatic pressure.
Pressure and fluid statics
Fluid and Pressure - 1/5
Force / areaSame-depth pressure
Built for quick scanning, filtering, and direct access.
Open conceptFluidsIntro25 minNot startedMastery: New
Continuity Equation
Keep one steady stream tube on screen and use Q = Av to connect cross-sectional area, flow speed, and the same volume flow rate through narrow and wide sections.
Steady flow and continuity
Fluid and Pressure - 2/5
Q = AvNarrower means faster
Built for quick scanning, filtering, and direct access.
Open conceptFluidsIntro30 minNot startedMastery: New
Bernoulli's Principle
Follow one steady ideal-flow pipe and see how pressure, speed, and height trade within the same Bernoulli budget while continuity keeps the flow-rate story honest.
Steady-flow energy and pressure
Fluid and Pressure - 3/5
P + 1/2 rho v^2 + rho g yContinuity plus Bernoulli
Built for quick scanning, filtering, and direct access.
Open conceptFluidsIntro30 minNot startedMastery: New
Buoyancy and Archimedes' Principle
Use one immersed-block bench to connect pressure difference, displaced fluid, and the density balance behind floating, sinking, and neutral buoyancy.
Buoyancy and displaced fluid
Fluid and Pressure - 4/5
Displaced fluidDensity balance
Built for quick scanning, filtering, and direct access.
Open conceptFluidsIntro30 minNot startedMastery: New
Drag and Terminal Velocity
Drop one body through a fluid and use mass, area, and drag strength to see drag grow with speed until force balance settles into terminal velocity.
Resistive motion and terminal speed
Fluid and Pressure - 5/5
F_d = k A v^2Force balance
Built for quick scanning, filtering, and direct access.
Open conceptThermodynamicsGood first moduleIntro30 minNot startedMastery: New
Temperature and Internal Energy
Compare average particle motion with whole-sample energy, vary amount and heating, and see why a phase-change shelf breaks naive temperature-only reasoning on one compact thermal bench.
Thermal foundations
Thermodynamics and Kinetic Theory - 1/4
Average particle motionAmount matters
Strong first module for getting into the public preview.
Open conceptThermodynamicsIntro30 minNot startedMastery: New
Ideal Gas Law and Kinetic Theory
Connect pressure, volume, temperature, and particle number on one bounded particle box, then read the same pressure changes back as changes in particle speed and wall-collision rate.
Gas-state bridge
Thermodynamics and Kinetic Theory - 2/4
P-V-T-N linkWall collisions
Built for quick scanning, filtering, and direct access.
Open conceptThermodynamicsIntro30 minNot startedMastery: New
Heat Transfer
See heat as energy transfer driven by temperature difference while conduction, convection, and radiation compete on one compact bench with honest pathway rates.
Heat flow
Thermodynamics and Kinetic Theory - 3/4
ConductionConvection
Built for quick scanning, filtering, and direct access.
Open conceptThermodynamicsIntro35 minNot startedMastery: New
Specific Heat and Phase Change
See why the same energy pulse changes different materials by different temperature amounts, and why a phase-change shelf can absorb or release energy without changing temperature on one compact thermal bench.
Thermal response
Thermodynamics and Kinetic Theory - 4/4
Q = m c delta TLatent-heat shelf
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntermediate30 minNot startedMastery: New
Circular Orbits and Orbital Speed
See why a circular orbit needs the right sideways speed, how gravity supplies the centripetal acceleration, and how source mass and radius together set orbital speed and period on one bounded live model.
Gravity and orbit bridges
Gravity and Orbits - 3/5
Gravity as centripetal accelerationOrbital speed
Built for quick scanning, filtering, and direct access.
Open conceptElectricityIntro25 minNot startedMastery: New
Electric Fields
See how source-charge sign, distance, and superposition set the electric field at one probe, then watch a test charge turn that field into a force without changing the field itself.
Field and force
Electricity - 1/6
Field directionSuperposition
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntermediate25 minNot startedMastery: New
Kepler's Third Law and Orbital Periods
Compare circular orbits around one source mass and see why larger orbits take longer: the path is longer, the circular speed is lower, and the same live model makes the period law visible without hiding the gravity-speed link.
Gravity and orbit bridges
Gravity and Orbits - 4/5
T^2 proportional to r^3Longer path and lower speed
Built for quick scanning, filtering, and direct access.
Open conceptElectricityIntro25 minNot startedMastery: New
Electric Potential
Map how source-charge sign and distance shape electric potential, compare potential differences across one honest scan line, and connect the downhill slope of V to the electric field.
Potential and voltage
Electricity - 2/6
Potential mapsEquipotentials
Built for quick scanning, filtering, and direct access.
Open conceptMechanicsIntermediate30 minNot startedMastery: New
Escape Velocity
Launch outward from one bounded gravity source and see how source mass, launch radius, and total specific energy decide whether the object escapes or eventually returns.
Gravity and orbit bridges
Gravity and Orbits - 5/5
Escape thresholdTotal specific energy
Built for quick scanning, filtering, and direct access.
Open conceptElectricityIntro25 minNot startedMastery: New
Basic Circuits
Keep one battery and two resistors in view while current, voltage, resistance, Ohm's law, and the contrast between series and parallel all stay tied to one honest circuit.
Circuits and Ohm's law
Electricity - 3/6
CurrentVoltage
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntro25 minNot startedMastery: New
Light as an Electromagnetic Wave
Connect electromagnetic waves to visible light, color, frequency, and the broader spectrum while one compact stage keeps the spectrum rail, field-pair sketch, and medium-linked wavelength changes tied together.
Wave view of light
Visible bandColor and frequency
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntro25 minNot startedMastery: New
Polarization
Use one compact polarizer bench to see polarization as the orientation story of transverse waves, how angle mismatch sets transmitted light, and why one ideal polarizer makes unpolarized light emerge with one chosen axis.
Wave orientation and filters
Wave Optics - 1/5
Transverse orientationMalus's law
Built for quick scanning, filtering, and direct access.
Open conceptElectricityIntro25 minNot startedMastery: New
Power and Energy in Circuits
Keep one source and one resistive load in view while current, power, and accumulated energy over time stay tied to the same honest circuit.
Power and energy
Electricity - 4/6
P = IVE = Pt
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntermediate30 minNot startedMastery: New
Diffraction
Watch a wave spread after one narrow opening, see why diffraction grows when wavelength competes with slit width, and build the wave-optics bridge toward double-slit interference.
Wave spreading and apertures
Wave Optics - 2/5
Slit width vs wavelengthCentral peak width
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntermediate30 minNot startedMastery: New
Double-Slit Interference
Use two coherent slits and one screen to connect path difference, phase difference, and fringe spacing to wavelength, slit separation, and screen distance on one compact optics bench.
Wave spreading and apertures
Wave Optics - 3/5
Path differenceFringe spacing
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntro25 minNot startedMastery: New
Refraction / Snell's Law
Watch one light ray cross a boundary, connect refractive index to speed change, and see Snell's law set the refracted angle, bending direction, and critical-angle limit on the same live diagram.
Boundaries and indices
Snell's lawRefractive index
Built for quick scanning, filtering, and direct access.
Open conceptElectricityIntro30 minNot startedMastery: New
Series and Parallel Circuits
Switch the same two loads between one loop and two branches, then track how current, voltage, brightness, and charge flow reorganize without changing the battery.
Series and parallel branches
Electricity - 5/6
Current splitVoltage sharing
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntermediate30 minNot startedMastery: New
Dispersion / Refractive Index and Color
Use one compact thin-prism bench to see how refractive index can depend on wavelength, why different colors bend by different amounts, and how a bounded prism model separates colors without widening into a full spectroscopy subsystem.
Color-dependent refraction
Wave Optics - 4/5
Color-dependent n(lambda)Prism spread
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntermediate25 minNot startedMastery: New
Total Internal Reflection
Push a ray from a higher-index medium toward a lower-index boundary, watch the critical angle emerge, and see the same live diagram hand off from ordinary refraction to full internal reflection.
Critical-angle threshold
Critical angleInternal reflection
Built for quick scanning, filtering, and direct access.
Open conceptElectricityIntro30 minNot startedMastery: New
Equivalent Resistance
Reduce one highlighted resistor group into an equivalent block, then collapse the whole mixed circuit honestly and watch how the total current and grouped behavior change together.
Mixed resistor groups
Electricity - 6/6
Reduce one groupR_group to R_eq
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntro25 minNot startedMastery: New
Mirrors
Use plane, concave, and convex mirrors to track equal-angle reflection, signed image distance, and magnification on the same live ray diagram.
Mirror imaging
Equal anglesVirtual vs real
Built for quick scanning, filtering, and direct access.
Open conceptElectromagnetismIntro25 minNot startedMastery: New
Magnetic Fields
See how current direction, wire spacing, distance, and superposition set the magnetic field around one or two long straight wires, with the stage arrows and scan graphs tied to the same live source pattern.
Fields around current
Magnetism - 1/3
Right-hand ruleField patterns
Built for quick scanning, filtering, and direct access.
Open conceptElectromagnetismIntro25 minNot startedMastery: New
Faraday's Law and Lenz's Law
Track one magnet passing one coil and see how changing magnetic flux linkage creates induced emf while Lenz's law fixes the response direction, with the stage, galvanometer, and graphs all driven by the same bounded motion.
Flux and induced emf
Magnetism - 2/3
Changing fluxInduced emf
Built for quick scanning, filtering, and direct access.
Open conceptElectromagnetismIntermediate30 minNot startedMastery: New
Maxwell's Equations Synthesis
See what each Maxwell equation says physically, how sources and circulation differ, and why changing electric and magnetic fields together unify electricity, magnetism, and light.
Field synthesis
Source lawsCirculation laws
Built for quick scanning, filtering, and direct access.
Open conceptElectromagnetismIntermediate30 minNot startedMastery: New
Electromagnetic Waves
See how changing electric and magnetic fields travel together as one rightward wave, with the local field pair, source-to-probe delay, and propagation cue all tied to the same compact live stage.
Changing fields and propagation
E and B togetherPropagation delay
Built for quick scanning, filtering, and direct access.
Open conceptElectromagnetismIntro30 minNot startedMastery: New
Magnetic Force on Moving Charges and Currents
Launch one moving charge through a uniform magnetic field, compare it with a same-direction current segment, and connect force direction, curvature, and current-based force on one bounded live stage.
Magnetic force and motion
Magnetism - 3/3
qv x B directionCurrent-segment force
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntro25 minNot startedMastery: New
Lens Imaging
Trace principal rays through converging and diverging lenses, connect the signed thin-lens equation to the diagram, and watch image distance and magnification respond to the same object setup.
Thin lenses
Focal lengthImage distance
Built for quick scanning, filtering, and direct access.
Open conceptOpticsIntermediate30 minNot startedMastery: New
Optical Resolution / Imaging Limits
Image two nearby point sources through one finite aperture and see why diffraction, wavelength, and aperture diameter limit how sharply an optical system can separate them.
Imaging limits and resolution
Wave Optics - 5/5
Rayleigh limitAperture versus wavelength
Built for quick scanning, filtering, and direct access.
Open conceptModern PhysicsIntermediate30 minNot startedMastery: New
Photoelectric Effect
Use one compact lamp-to-metal bench to see why light frequency sets electron emission, why intensity alone fails below threshold, and how stopping potential reads the electron energy honestly.
Light and matter
Modern Physics - 1/5
Threshold frequencyIntensity vs energy
Built for quick scanning, filtering, and direct access.
Open conceptModern PhysicsIntermediate30 minNot startedMastery: New
Atomic Spectra
Link discrete emission and absorption lines to allowed energy-level gaps with one compact ladder-and-spectrum bench that keeps transitions, wavelengths, and mode changes tied together.
Quantized line spectra
Modern Physics - 2/5
Emission vs absorptionDiscrete spectral lines
Built for quick scanning, filtering, and direct access.
Open conceptModern PhysicsIntermediate30 minNot startedMastery: New
de Broglie Matter Waves
Use one compact matter-wave bench to see how particle momentum sets wavelength, why heavier or faster particles get shorter wavelengths, and how whole-number loop fits form a bounded bridge toward early quantum behavior.
Matter waves and quantum bridge
Modern Physics - 3/5
Momentum sets wavelengthMass or speed can shorten lambda
Built for quick scanning, filtering, and direct access.
Open conceptModern PhysicsIntermediate30 minNot startedMastery: New
Bohr Model
Use a compact hydrogen bench to connect quantized energy levels, allowed transitions, and named spectral-line series while staying clear that Bohr is a useful historical model rather than the final quantum description.
Hydrogen energy levels
Modern Physics - 4/5
Hydrogen seriesQuantized levels
Built for quick scanning, filtering, and direct access.
Open conceptModern PhysicsIntermediate30 minNot startedMastery: New
Radioactivity and Half-Life
Use one compact decay bench to see why each nucleus decays unpredictably, why large samples still follow a regular half-life curve, and how to read remaining-count graphs honestly.
Nuclear decay and chance
Modern Physics - 5/5
Single-event chanceHalf-life checkpoints
Built for quick scanning, filtering, and direct access.
Open conceptContinue learning
Pick up the concept you were working through last.
Local-first progress.
No local progress yet. Open a concept, try the simulation, and Open Model Lab will remember your progress on this browser first, then let you sign in later if you want sync.
Start a conceptReview queue
Revisit the concepts that need the clearest next pass.
These cues stay transparent on purpose. They reuse saved quick-test misses, unfinished challenge work, ready checkpoints, entry diagnostics, mastery signals, elapsed time, and starter-track recap context instead of introducing a separate scheduler.
Local-first review cues.
The review queue appears after you work through a concept. Open a concept, use the lab, and finish a quick test or challenge to seed the first revisit cues.
Topic routes
Use topic landing pages when you want the library to feel more situated.
Topic pages stay tied to canonical metadata, starter-track recommendations, and local progress cues, but they give learners a stronger sense of where they are before opening a specific concept.
Topic12 concepts310 min3 starter tracks
Oscillations and Waves
Follow repeating motion from one oscillator into traveling waves, sound as a longitudinal wave, pitch-versus-loudness cues, beats from nearby frequencies, Doppler shifts from motion, superposition, standing patterns, and driven resonance.
FoundationsEnergy in SHM
Best first concepts
Topic15 concepts400 min3 starter tracks
Mechanics
Use vectors, balance and rotational cause, angular momentum, trajectories, gravity fields and potential, circular orbits, orbital periods, escape thresholds, impulse, conservation, and collisions to read motion and interactions on the same simulation-first surface.
Vector foundationsTwo-dimensional motion
Best first concepts
Topic5 concepts145 min1 starter track
Fluids
Start with pressure as force per area, then keep the fluids story coherent through hydrostatic pressure, steady-flow continuity, Bernoulli's speed-pressure-height trade, buoyancy from displaced fluid, and resistive drag that settles into terminal speed.
Pressure and fluid staticsSteady flow and continuity
Best first concepts
Topic4 concepts125 min1 starter track
Thermodynamics
Separate temperature from total internal energy, bridge that microscopic story into gas pressure and the ideal-gas law, then follow how thermal energy crosses boundaries and shapes honest heating curves on one compact thermal branch.
Thermal foundationsGas-state bridge
Best first concepts
Topic6 concepts160 min1 starter track
Electricity
Move from source charges and voltage into simple loops, power, branch behavior, and equivalent resistance without leaving the same compact electricity path.
Field and forcePotential and voltage
Topic5 concepts140 min2 starter tracks
Electromagnetism
Use current-made magnetic fields, changing flux, Maxwell's four-law synthesis, magnetic force, and field-pair propagation without turning the branch into a detached rule list.
Fields around currentFlux and induced emf
Best first concepts
Topic10 concepts270 min1 starter track
Optics
Use one bounded optics path to move from light's wave identity into polarization, diffraction, double-slit interference, refraction, prism dispersion, critical angles, mirrors, thin-lens image formation, and the diffraction limits that cap real resolution.
Wave view of lightWave orientation and filters
Best first concepts
Topic5 concepts150 min1 starter track
Modern Physics
Keep the modern-physics branch bounded with the photoelectric effect, atomic spectra, de Broglie matter waves, the Bohr model, and radioactivity / half-life so threshold emission, discrete lines, matter wavelength, quantized hydrogen levels, and probabilistic nuclear decay all stay tied to compact, visually honest benches instead of detached historical anecdotes.
Light and matterQuantized line spectra
Best first concepts
Starter tracks
Use a starter path when you want the expanded concept set to feel ordered.
These tracks still point back into the same reusable concept pages and shared progress seams. The redesign just keeps them compact and close to the library instead of feeling like a separate destination.
Starter track3 concepts75 min2 checkpoints
Motion and Circular Motion
Not startedStart with vector components, move into projectile paths, and then use circular motion to understand how velocity can keep changing direction.
ComponentsTrajectoriesCentripetal acceleration
Track progress
0 / 5 moments complete
0 / 3 concepts and 0 / 2 checkpoints cleared.
1Vectors and Components
Start here2Projectile Motion
Ahead3Uniform Circular Motion
AheadVectors and Components opens this track and sets up the rest of the path.
Starter track5 concepts130 min3 checkpoints
Rotational Mechanics
Not startedStart with torque as the turning effect of force, use centre of mass and support region for static balance, then carry the same rotational language into moment of inertia, rolling motion, and angular momentum.
Torque and lever armsCentre of massMoment of inertia
Track progress
0 / 8 moments complete
0 / 5 concepts and 0 / 3 checkpoints cleared.
1Torque
Start here2Static Equilibrium / Centre of Mass
Ahead3Rotational Inertia / Moment of Inertia
Ahead2 more steps in the full track
Torque opens this track and sets up the rest of the path.
Starter track5 concepts135 min3 checkpoints
Gravity and Orbits
Not startedStart with one source mass creating a field and potential well, then use that same gravity model to explain circular speed, orbital periods, and the escape threshold.
Inverse-square fieldPotential wellCircular-year timing
Track progress
0 / 8 moments complete
0 / 5 concepts and 0 / 3 checkpoints cleared.
1Gravitational Fields
Start here2Gravitational Potential and Potential Energy
Ahead3Circular Orbits and Orbital Speed
Ahead2 more steps in the full track
Gravitational Fields opens this track and sets up the rest of the path.
Starter track3 concepts80 min2 checkpoints
Oscillations and Energy
Not startedBuild from one clean oscillator to energy exchange and then to driven resonance, so the same system grows without changing its core ideas.
Restoring forceEnergy exchangeResonance
Track progress
0 / 5 moments complete
0 / 3 concepts and 0 / 2 checkpoints cleared.
1Simple Harmonic Motion
Start here2Oscillation Energy
Ahead3Damping / Resonance
AheadSimple Harmonic Motion opens this track and sets up the rest of the path.
Starter track5 concepts145 min3 checkpoints
Fluid and Pressure
Not startedStart with pressure in a resting fluid, then carry that same branch through continuity, Bernoulli, buoyancy, and drag-limited motion.
Pressure in fluidsContinuity and flowBernoulli trade
Track progress
0 / 8 moments complete
0 / 5 concepts and 0 / 3 checkpoints cleared.
1Pressure and Hydrostatic Pressure
Start here2Continuity Equation
Ahead3Bernoulli's Principle
Ahead2 more steps in the full track
Pressure and Hydrostatic Pressure opens this track and sets up the rest of the path.
Starter track9 concepts230 min2 checkpoints
Waves
Not startedUse oscillation as the entry point, lock down wave speed and wavelength, carry that into longitudinal sound and pitch-versus-loudness cues, add beats as the nearby-frequency superposition bridge, then move into Doppler shifts, interference, standing-wave patterns, and open-vs-closed air-column resonance without losing the live connection between motion and graph.
Oscillation linkSpeed and wavelengthLongitudinal sound
Track progress
0 / 11 moments complete
0 / 9 concepts and 0 / 2 checkpoints cleared.
1Simple Harmonic Motion
Start here2Wave Speed and Wavelength
Ahead3Sound Waves and Longitudinal Motion
Ahead6 more steps in the full track
Simple Harmonic Motion opens this track and sets up the rest of the path.
Starter track4 concepts125 min3 checkpoints
Thermodynamics and Kinetic Theory
Not startedStart with temperature-versus-internal-energy bookkeeping, reuse that particle story for gas pressure, then follow energy transfer into heating curves and phase-change shelves.
Temperature vs UGas pressure from particlesHeat-flow pathways
Track progress
0 / 7 moments complete
0 / 4 concepts and 0 / 3 checkpoints cleared.
1Temperature and Internal Energy
Start here2Ideal Gas Law and Kinetic Theory
Ahead3Heat Transfer
Ahead1 more steps in the full track
Temperature and Internal Energy opens this track and sets up the rest of the path.
Starter track6 concepts160 min2 checkpoints
Electricity
Not startedStart with source charges and voltage, then carry that same circuit story into current, power, branch behavior, and equivalent resistance.
Field causeVoltage bridgePower and energy
Track progress
0 / 8 moments complete
0 / 6 concepts and 0 / 2 checkpoints cleared.
1Electric Fields
Start here2Electric Potential
Ahead3Basic Circuits
Ahead3 more steps in the full track
Electric Fields opens this track and sets up the rest of the path.
Starter track3 concepts80 min3 checkpoints
Magnetism
Not startedStart with current-made magnetic fields, turn changing flux into induced emf with Faraday and Lenz, and then reuse that same field direction story to explain magnetic force on charges and currents.
B-field patternsFaraday / LenzChanging flux
Track progress
0 / 6 moments complete
0 / 3 concepts and 0 / 3 checkpoints cleared.
1Magnetic Fields
Start here2Faraday's Law and Lenz's Law
Ahead3Magnetic Force on Moving Charges and Currents
AheadMagnetic Fields opens this track and sets up the rest of the path.
Starter track5 concepts120 min3 checkpoints
Sound and Acoustics
Not startedStay on the sound branch long enough that longitudinal motion, pitch-versus-loudness cues, beats, Doppler shifts, and open-vs-closed air-column resonance feel like one acoustics path instead of isolated pages.
Longitudinal soundPitch vs loudnessBeats
Track progress
0 / 8 moments complete
0 / 5 concepts and 0 / 3 checkpoints cleared.
1Sound Waves and Longitudinal Motion
Start here2Pitch, Frequency, and Loudness / Intensity
Ahead3Beats
Ahead2 more steps in the full track
Sound Waves and Longitudinal Motion opens this track and sets up the rest of the path.
Starter track5 concepts145 min3 checkpoints
Wave Optics
Not startedFollow the bounded wave-optics branch from polarization into diffraction, double-slit interference, color-dependent refraction, and imaging limits so the newer optics pages read like one compact path instead of isolated stops.
Wave orientationSingle-slit spreadTwo-slit fringes
Track progress
0 / 8 moments complete
0 / 5 concepts and 0 / 3 checkpoints cleared.
1Polarization
Start here2Diffraction
Ahead3Double-Slit Interference
Ahead2 more steps in the full track
Polarization opens this track and sets up the rest of the path.
Starter track5 concepts150 min3 checkpoints
Modern Physics
Not startedFollow the bounded modern-physics branch from threshold emission into line spectra, matter waves, the Bohr hydrogen model, and half-life so the new concept set reads like one path instead of five isolated pages.
Threshold frequencyDiscrete spectral linesMatter wavelength
Track progress
0 / 8 moments complete
0 / 5 concepts and 0 / 3 checkpoints cleared.
1Photoelectric Effect
Start here2Atomic Spectra
Ahead3de Broglie Matter Waves
Ahead2 more steps in the full track
Photoelectric Effect opens this track and sets up the rest of the path.