I am trying to recreate a car with real life physics and I am unsure how to go about calculating the mass, I am using 2 blocks on the car to make the weight changeable one on the front axle and one on the back, but how would I go about changing the density to make it have a mass equal to 1 lb or 1 kg, currently this is my script

```
1. Conversion = 0.01212121212
2. Weight = script.Parent.Parent.Parent.Main_Script.Stats.Weight.Value*Conversion
3. script.Parent.CustomPhysicalProperties = PhysicalProperties.new(Weight/2, 0.5, 1, 0.3, 1)
```

Any help would be appreciated