Illustrated Concepts

Visualize motion under gravity with live control of g, height, and initial velocity.

Watch α-particles scatter from a tiny nucleus with controllable Z and energy.

Moving spaceship and clocks: see time dilation and length contraction as v/c changes.

Rubber-sheet spacetime and gravitational lensing: see mass curve the grid and light rays bend.

Event horizon, bent light rays, and time slowing near the hole. Adjust mass and impact parameter.

2D space folded into a tunnel: see shortcuts and why wormholes are unstable.

Closed timelike curves, timeline splitting, and why paradoxes happen.

Particles gradually forming an interference pattern. See wave–particle duality.

States overlapping like Schrödinger's cat. See probability clouds instead of fixed positions.

Two particles reacting together no matter the distance. Measure one and see the other correlate.

Energy barrier with E < V₀: particles tunnel through classically forbidden regions.

Before measurement: fuzzy probability. After: one sharp outcome.

Drive an oscillator at its natural frequency and watch the amplitude soar. Adjust damping and force for dramatic effects.

Alpha particles and a massive nucleus at nuclear scales. Adjust MeV, fm and mass units to see how they change scattering.

Visualize 2D projectile motion with adjustable speed, launch angle, height and gravity.

Interactive v–t and x–t graphs for kinematics.

Explore v = u + at, s = ut + ½at² and v² = u² + 2as.

Drive a damped oscillator and see amplitude peak at resonance when f ≈ f₀.

Explore how friction stops a sliding block. Adjust mass, initial velocity, and friction; see stopping distance and work done. Net Work = ΔKE.