In electromagnetizm, opposites attract.
In Gravity, opposites repel…objects with positive mass attract.
How do the strong and weak nuclear forces compare?
Wha? There’s no such thing as anti-gravity.
Presumably, Enola Straight is referring to the interplay between positive mass and theoretical negative mass.
I’m not sure what an “opposite” would be for mass with regard to gravity. But anyway, one theory is that it’s a question of how many types of “charge” each force has: gravity only has one charge, electromagnetism has two, the strong nuclear force has three (or eight if you’re talking about gluons instead of quarks), etc.
In a nutshell the Strong force holds together the quarks
The weak force allows for radioactive decay
A factor in the forces depends on the distance. The strong force for instance only applies to the subatomic. While gravity is virutally absent (though not totally absent) from the nuclear level.