Is it theoretically possible to set a part's mass to 0?

I'm trying to create a 0 gravity environment in which a BodyForce inside the torso counteracts the forces of gravity (the force value of the BodyForce is equal to the torso's mass times 196.2). The problem is that when I try to put a BodyForce into all of the character's parts using the same principles, it doesn't counteract the gravity; it only causes the player to jump higher. Is there a way to "ignore" a part's mass altogether or set it to 0 using custom physics properties? I checked the wiki and I haven't seen anything about altering the mass, only the density.

Thank you!