"Perpetual Motion" is a bit of a misnomer. The term should be "perpetual force".
If it were "perpetual motion", then everything would constantly be in relative perpetual motion until death of the universe. For example: despite me sitting motionless relative to my computer, I am moving relative to the moon, or the sun, or pretty much everything else in the universe.
If it were "perpetual motion", then everything would constantly be in relative perpetual motion until death of the universe. For example: despite me sitting motionless relative to my computer, I am moving relative to the moon, or the sun, or pretty much everything else in the universe.