Electric Force (EF) exists between any objects that have an electric charge, like a child and a slide. Objects can have either a positive electric charge or a negative electric charge.
If an object has a positive charge and another has a negative charge, then they are drawn towards each other, but if both of them have the same charges, then they repel each other.
The electric force between two objects also depends on the size of the charges in an object. If an object has a bigger charge and is closer to the other object, then the electric force is stronger. The smaller the charge is, the smaller the EF between the objects. The farther the objects are from each other, the smaller the EF is between them.