It's a glob of teensy-tiny mischievious Marcell Marceaus, and you're worried about the physics of it's thriving on kinetic motion? :)
Okay, I am a little bit too, but given that there's always relative forces pulling down on them (gravity), if they get 'hungry', they can just fall to gather some yummy potential energy. Or maybe it consumes tiny amounts of atmosphere, there's a lot of energy in a molecule of H2O. Or perhaps it passively takes in light, or any combination thereof. Hell, maybe it feeds off of shenanigans!