The revision cards, made draggable

Twelve labs paired with the H2 revision PDFs — every lab names the cards it proves. Real physics under every slider.

Cards Explorer

Search any of the 85 cards — claim, explanation, proof.

x/v/a · energy · damping

Spring in 3D with live graphs — v peaks at equilibrium, a at the extremes, energy bars trade.

small angles · g presets

Real pendulum vs 2π√(L/g). Crank θ₀ and watch them split; change mass and watch nothing happen.

phasors · phase leads

A rotating peg's shadow IS SHM — why v leads x by π/2 and a is antiphase, as geometry.

f_d sweep · response curve

Drive the spring, build the response curve yourself, watch damping lower and broaden the peak.

two graphs · Δφ · who leads

Beads stay put while the shape travels. Pick two particles: live phase difference and lead/lag.

C/R at zero · Δp shift λ/4

Compressions travel down a particle tube; guide lines land exactly on the graph zeros.

why sound can't · Malus

A slit kills a crossed transverse rope but does nothing to a longitudinal wave — at any angle.

1/r² · diluted not lost

Sphere, hemisphere, ripple, beam — drag a detector; total power through the front never budges.

rays ⊥ fronts · d·sinθ

λ-caliper on the rings, the oblique-incidence triangle, and the sin θ = y/y₀ protractor.

f never changes · I ∝ f²A²

Cycle counters across a boundary never drift; doubling buttons prove the intensity chain.

working CRO · λ = 2d rig

The two syllabus experiments as instruments — the CRO grades your reading of a hidden f.

d⁴ machine · f = c/λ

The PkS/16π²d⁴ formula assembles itself as the pulse flies; spectrum on a log-λ slider.

Companions to the Oscillations and Wave Motion revision PDFs.