It states that, when viewed in an inertial reference frame, an object at rest remains at rest and an object in motion continues in motion with constant velocity unless it is acted on by an external net force.
(it; is acted; T:on; by an external net force) (It; states; that, when viewed in an inertial reference frame, an object at rest remains at rest and an object in motion)
it It
is acted states
T:on by an external net force
that, when viewed in an inertial reference frame, an object at rest remains at rest and an object in motion