private void Update(float timeInSeconds)
{
//Friction generates heat, so heavier and faster means more heat..
double friction = _centre.AngularVelocity.Z * _centre.Mass * _frictionFromSlider;
double energyToRemove = friction * 0.1;//random scaling number... friction is just a coefficient anyway so this can be whatever suits...
//now remove that heat energy from the sytem
_centre.AddRotationalKineticEnergy(new Vector(0, 0, -energyToRemove));
_centre.Move(timeInSeconds);
_wheel.Rotation = (float)_centre.RotationAsDegreesPerSecond().Z;
UpdateLabels();
}