The Coulomb constant, which can be entered here, corresponds to the ε₀ of physics. A non-zero value for the Coulomb constant is a prerequisite for simulating mutual electrostatic interaction between charged particles or the action of an external electric field.
The same applies in a corresponding manner for the gravitational constant (g of physics), and thus for the gravitational interaction between particles.
In addition, an external gravitational field can be simulated in z-direction. By entering negative values falling movements downwards are simulated.