Community-built physics experiments and study materials — run an experiment live and fork it into your own studio, or read a guide someone wrote.
One grid cell is 10 femtometres. One mass unit is one atomic mass unit, one charge unit is one elementary charge — so the nucleus on screen literally reads mass 197, charge 79, and that is gold. Eleven alpha particles enter at 1.5 x 10^7 m/s, each aimed to miss by a different distance. Nothing here is a scattering formula being drawn: it is Coulomb's law with the real constant, integrated 120 times a second, and the one aimed dead centre stops 29.6 fm out and comes back.
Seven tonnes falling at 6 m/s with fourteen metres to go, onto a shock-absorbing deck, in a sixth of Earth's gravity. Nothing scripts this landing. A node graph on the lander reads its own height and velocity every step, decides a throttle, and pushes — that graph IS the autopilot, and every number in it is a slider. Turn the gain down and watch it arrive too fast. Lengthen the contact probe and watch it cut the engine too early. Sideways is your job.
