Object's mass doesnt change despite massless value being on

Oh, honestly thanks for the information! I’ve been dumb enough to use :ApplyImpulse for a while now since I also got used to it.

But thanks for this! :)))

And @ZestyIsSour.
Sounds like they are trying to use Fluid Forces to fly an airplane. In that case there shouldn’t be an anti-gravity script or force applied.

In roblox impulse uses the impulse equation with velocity and mass AFAIK.
J = m*dv
I think that because its instantaneous.