The revision cards, made draggable
22 labs across four H2 topics. Every lab names the cards it proves, and real physics runs under every slider.
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Topic 7 · Gravitational Field3 labs · 33 cards
Field & Force
F = Gm₁m₂/r² · g = GM/r²
Field arrows shrink outward as 1/r². Two-mass mode finds the Earth–Moon neutral point numerically.
Potential & Energy
φ = −GM/r · g = −dφ/dr
A 3D potential well, a live tangent proving g is the gradient, and an escape-velocity launcher.
Circular Orbits
T² ∝ r³ · geostationary
Drag r and Kepler III builds itself. Break any geostationary condition and the ground track drifts.
Topic 10 · Oscillations6 labs · 39 cards
Mass–Spring
x/v/a · energy · damping
Spring in 3D with live graphs — v peaks at equilibrium, a at the extremes.
Pendulum
small angles · g presets
Real pendulum vs 2π√(L/g). Crank θ₀ and watch them split; change mass, nothing happens.
SHM Test & Graphs
a = −ω²x · v–x ellipse
Run fake SHM against real: only a = −ω²x traces a straight a–x line. Graphs built by taking gradients.
Energy in SHM
2f energy graphs · ¾E
Energy against displacement AND against time, side by side — the 2f doubling made countable.
Circular ↔ SHM
phasors · phase leads
A rotating peg's shadow IS SHM — why v leads x by π/2, as geometry.
Resonance & Damping
f_d sweep · response curve
Drive the spring, build the response curve, watch damping lower and broaden the peak.
Topic 11 · Wave Motion8 labs · 46 cards
Wave Anatomy
two graphs · Δφ · who leads
Beads stay put while the shape travels. Pick two particles for live phase difference.
Longitudinal & Sound
C/R at zero · Δp shift λ/4
Compressions travel down a particle tube; guide lines land exactly on the graph zeros.
Polarisation
why sound can't · Malus
A slit kills a crossed transverse rope but does nothing to a longitudinal wave, at any angle.
Intensity & Spreading
1/r² · diluted not lost
Sphere, hemisphere, ripple, beam — total power through the wavefront never budges.
Wavefronts & Geometry
rays ⊥ fronts · d·sinθ
λ-caliper on the rings, the oblique-incidence triangle, and the sin θ = y/y₀ protractor.
Boundary & Energy
f never changes · I ∝ f²A²
Cycle counters across a boundary never drift; doubling buttons prove the intensity chain.
Measurement
working CRO · λ = 2d rig
The two syllabus experiments as instruments — the CRO grades your reading of a hidden f.
Radar & EM Spectrum
d⁴ machine · f = c/λ
The PkS/16π²d⁴ formula assembles itself as the pulse flies.
Topic 12 · Superposition5 labs · 42 cards
Principle
pulses pass through · 2A cos(Δφ/2)
Two pulses cancel to a flat string, then emerge unchanged. Coherent vs randomised phase, side by side.
Stationary Waves
N–N = λ/2 · odd harmonics
Watch the flat moment at T/4, then see a closed pipe visibly skip every even harmonic.
Two-Source Interference
λ = ax/D · path difference
Fringes computed from real path lengths. Probe any point for a BRIGHT or DARK verdict.
Diffraction
sinθ = λ/b · Rayleigh
Wide gap vs narrow gap in a ripple tank, then two stars merging at the resolving limit.
Diffraction Grating
d sinθ = nλ · orders
Orders at true angles, impossible orders greyed out, white light fanning into real spectra.
Companions to the Gravitation, Oscillations and Wave Motion revision PDFs.