By Newton's first law of motion, it can be concluded that inertia of an object is inversely proportional to the mass of the object. In other words, larger the mass smaller the inertia and vice-versa.
The mass of the objects and the distance between them.
the frame of referance
The mass of the objects and the distance between the objects.
Gravity can depend on how far apart and how heavy the objects are.
Variance of gravitational forces.
density that is dependant on mass
Gravitational forces depend on the masses of the objects involved and the distance between them. The force of gravity increases with the mass of the objects and decreases with the distance between them.
If there is a single property of physical objects upon which both electrical and gravitational forces depend it is the property of mass. Without mass, there is no gravity. Likewise, without mass, the are no sources for electrical fields or apparatus for separating and transmitting charges.
Smell
The electric force between two objects does not depend on the objects' mass. It depends on their charges and the distance between them.
That would depend on what objects are being abstracted, and from what source. Abstracting objects can refer to advanced mathematics, Java, and object classification among other fields.
Mass and Distance