Simulations
Interactive, watermarked physics demonstrations — pick one to adjust its parameters and run it.
Bernoulli's Venturi Tube
FREESend fluid through a pipe that narrows to a throat and widens back out — adjust the inlet/throat diameters, flow speed, fluid density, and inlet pressure to watch tracer particles speed up in the throat while manometers show the pressure drop Bernoulli's equation predicts.
Open simulation →
Buoyancy (Archimedes' Principle)
FREEDrop a uniform object into a tank of fluid — adjust the object's density, the fluid's density, and the object's size to see it settle at its equilibrium floating depth, or sink straight through, exactly as Archimedes' principle predicts.
Open simulation →
Kepler's Laws
ORBITWatch a planet trace an exact elliptical orbit with the star at one focus, its equal-time sectors shaded to show equal-area sweeps, and a second comparison planet whose period and semi-major axis satisfy the same T^2/a^3 ratio.
Locked — requires Orbit →
Nuclear Fission Chain Reaction
INTERSTELLARLoad a sample of some isotope — adjust the isotope, purity, fuel amount, moderator, and cooling/control rods to see the chain reaction fizzle out, self-sustain, or run away, generation by generation.
Locked — requires Interstellar →
Photoelectric Effect
LAUNCHShine light of a chosen frequency onto a metal plate — adjust the frequency and the metal's work function to see whether an electron is ejected at all, and at what speed, exactly as Einstein's photon picture predicts.
Locked — requires Launch →
Radioactive Decay
FREEStart with a sample of undecayed nuclei — adjust the initial count and half-life to watch the population (and a grid of individual nuclei) decay exponentially.
Open simulation →
Reach the Moon
ORBITChoose your launch bearing, injection speed, flight-path angle, and lead the Moon's own motion — simulate a real Earth-Moon transfer and see if you reach the Moon's sphere of influence. Reaching it refunds your run.
Locked — requires Orbit →
Rutherford Scattering
LAUNCHFire a beam of alpha particles at a single heavy nucleus — adjust the alpha energy, target atomic number, particle count, and impact-parameter spread to watch Coulomb repulsion alone deflect each trajectory, most only slightly and a rare few sharply back the way they came.
Locked — requires Launch →