Just like mass is the property that underlies gravitational forces (the more mass, the stronger the gravitational pull), charge is the property that determines the strength and direction of electrical forces.

Here's a breakdown:

* Gravitational Force: Objects with mass attract each other. The more mass they have, the stronger the attraction.

* Electrical Force: Objects with charge can either attract or repel each other. The amount of charge and the type of charge (positive or negative) determine the strength and direction of the force.

Here's the key difference:

* Gravitational Force: Only attractive, always pulls objects together.

* Electrical Force: Can be both attractive (opposite charges) and repulsive (like charges).

In summary: Charge is the fundamental property that determines electrical forces, just like mass determines gravitational forces.