SimPhy supports setting up of various fields other than gravity.
The gravitational force on an object is calculated as
Force = mass x gravity x gravityFactor
Electrostatic field (in N/C)added to the world, apply force on object if and only if it has non zero charge and it is inside bounds of field.
The magnetic lorentz force on an object is calculated asForce = charge x speed x magnetic field and is perpendicular to the velocity
Buoyancy and drag:
Buoyancy can be added to a region representing hypothetical liquid in that region. The density and viscosity of liquid can be changed while adding/editing field.