"We're going to crash these cars, by the way." That's how Eon opens this episode of BeamNG with his dad. But what starts as smashing a blue police car and an orange one quickly turns into a real science lesson — because BeamNG lets you change the gravity, and Eon and his dad dig into what those numbers actually mean. Along the way they read negative numbers, compare planets, and find out the game is really a giant calculator pretending to be a road.
Why gravity is a negative number
Eon opens the environment menu and scrolls to the gravity setting. Earth gravity shows up, and his dad jumps on it right away: "It's not a plus, it's a minus. 9... point... 81. So why is minus? I want you to think about this."
That's the heart of the lesson. Gravity is a pull toward the ground, so the game writes it as a negative number: -9.81. His dad makes it physical: "Remember, this is ground zero. Going down is minus. So the gravity is pulling you down." Eon jumps in the game and watches the car drop back: "If I jump, it pulls me down." The minus sign isn't scary math — it's just an arrow pointing down.
Then they flip it. Switching to "negative Earth gravity" turns the -9.81 into a +9.81, and now the force points the other way — it shoves the car up off the bridge. Same number, opposite sign, opposite direction. Eon watches his car get launched into the sky. The sign tells you which way the force goes.
A bigger minus is a stronger pull
Now the fun part: which planet pulls hardest? They try Jupiter and read it together — about -24.92. Dad asks the key question: "Earth's gravity is minus nine. Jupiter is minus twenty-four. Which one is more negative?" Eon guesses Jupiter, and he's right: "Yeah, because 24, but it's negative." His dad draws the number line out loud — "this is zero, this is minus nine, then minus twenty-four, way down."
But Jupiter wasn't enough. They crank it to Sun gravity and try to read the giant number: around -274. The cars don't just crash — they get crushed flat into what Eon calls "spaghetti," and the game starts to lag from all the damage. The pattern is clear and it's a great number-sense idea: the farther a number is from zero on the minus side, the stronger the downward pull. Earth squishes a little, Jupiter squishes more, the Sun flattens everything.
The game is really a pile of models
While cars are flying, Eon's dad keeps reminding him this isn't magic — it's a simulation. When a new map loads, the screen shows "loading meshes," and he explains: "Basically we made models of the meshes." Even the shine on the cars is math: "We have to calculate where the sun hit here... look, the reflection here, two reflections."
That's why BeamNG feels so real. It uses soft-body physics — each car is built from thousands of connected points, so when it hits something it really bends and breaks. Eon sees messages like "radiator damaged" and "the door ripped off," and his dad points out the catch: "Once it's been crashed, you can't be restored." The damage is permanent, just like denting real metal — until you respawn a fresh car.
Comparing big numbers (and big trucks)
The number-comparing skill shows up again with weight. Looking at a heavy steel coil, Eon wants the 30-ton version. His dad turns it into a quick quiz: "Which number is bigger — 5, 10, 20, or 30? ... What about 10 tons and 30 tons, which is heavier?" Eon: "30." Exactly — comparing 30 vs 10 tons is the same thinking as comparing -24 vs -9 gravity. Bigger size, bigger effect. A 30-ton coil dropped under Sun gravity crushes cars "like a billion."
They also play with time of day, dragging a slider from afternoon to 23:59 — "nearly midnight, really really dark" — another reminder that everything in the simulation is just a setting you can change.
Try it
Make your own gravity number line on paper. Put 0 in the middle. To the left, mark Earth at -9.81, then Jupiter at -24.92, then the Sun at about -274. Which one is farthest from zero? That's the strongest pull — the one that would flatten a car fastest. Then ask a grown-up: if a number can be negative to mean "pull down," what would a positive gravity do? (Like Eon found: it pushes things up!)