Mechanica Team

@team7569

Joined 21d ago · 10 published · 0 upvotes · 4 forks

Published Experiments (10)

The gold foil: finding the nucleus

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.

nuclearelectrostaticsunits

@team75690212

7h ago

Land it: an autopilot you can take apart

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.

controlrocketsgravity

@team75690226

7h ago

A gas, one molecule at a time

Twenty-four perfectly elastic balls in a sealed box. There is no temperature setting here, because temperature is not a thing you set -- it is the average kinetic energy of these bodies, on the energy chart. Pressure is the balls hitting the walls. Nothing damps them, so the total energy line stays flat, and the speeds shuffle into a spread through collisions alone: thermodynamics as mechanics, with the statistics left to emerge.

thermodynamicskinetic theorycollisions

@team7569009

3d ago

Mass spectrometer

Two ions carrying the same charge enter the same magnetic field at the same speed, and the field sorts them by mass. A magnetic force is always perpendicular to the motion, so it never speeds anything up -- it only bends. The heavier ion bends wider and lands further along the plate; the gap between the landing points is the measurement. Nothing is choreographed: the engine applies F = q(v x B) every step and the arcs are whatever that produces.

electromagnetismlorentz forcecharge

@team7569009

3d ago

Earth and the Moon, to scale

The real Earth-Moon system, in real units. One grid cell is 1000 km, one mass unit is 10^22 kg, one second is ten minutes. Nothing is tuned: Earth carries its measured 5.97 x 10^24 kg, the Moon sits 384,400 km away, and the pull is Newton's F = G M m / r squared with G converted into these units. The 27.3-day orbit that comes out is what those numbers produce. Only the globes are drawn larger than life so you can see them; their masses are untouched.

gravityorbitsscale

@team7569009

3d ago

Where the bounce goes

Rubber, steel, oak and clay, all the same size, all dropped from ten metres at the same instant. Each one carries a property wired from nodes that computes its live kinetic energy and its total path length, and each one glows with the energy it has left. Watch the clay give everything to the floor on the first hit while the rubber ball keeps handing it back. The glow is not a lighting effect — it is ½mv², measured every step.

restitutionmaterialsenergy

@team7569009

3d ago

What holds a moon up

Earth, at its measured mass and its measured radius. One grid cell is a thousand kilometres and one second is ten minutes. The moon is at 12,000 km travelling at 5,765 m/s, which is exactly the speed a circle needs there — nobody chose that number, √(GM/r) did. It also carries an engine: a property wired from nodes that lights for three seconds and pushes along its own velocity. Watch what one small shove does to the far side of the orbit.

orbitsgravityescape velocity

@team7569009

3d ago

The thing that eats

There is no 'black hole' primitive in this studio, and there never will be. This one is built out of parts you can open and read: pull everything within reach, destroy whatever touches me, count what I have swallowed, glow brighter as I feed, throw out a spray each time, and when I am full, collapse. Fourteen nodes, wired in the property editor, running live inside the solver. Open it — the button is in the inspector — and change the numbers while it runs.

custom propertynode editorgravity

@team7569009

3d ago

A pendulum cannot climb higher than it fell

A six-kilogram bob is pulled aside and let go. It will swing down, sweep along the floor, and rise on the far side — and it will not, ever, come back higher than where it started. Everything it has at the bottom it bought with height on the way down. The block is placed exactly where the bob still has enough left to reach it. Move the rope length, change the bob's mass, and see which of those two the arrival speed actually cares about.

pendulumenergy conservationcollisions

@team7569009

3d ago

Do heavy things fall faster?

Three balls, the same size, weighing 50 g, 1 kg and 20 kg. There is no air in this room. Watch them all the way down and note when each one passes the marks on the wall. Then put the air back, one notch at a time, and watch the light one give up first. Nothing was rigged: the same gravity acts on all three, and the reason your intuition says otherwise is standing in the room with you the whole time.

gravityfree fallair resistance

@team7569009

3d ago