Inverted: FNS Comet speeds up without its engines on, without using a gravity assist technique.
Subverted: "Our engines have spontaneously disassembled themselves! We're going to be drifting through space!" "What? No, that's stupid. There's no friction in space."
Doubly Subverted: FNS Comet slows through space friction, just not when or at the rate it was expected to.
Parodied: "Our engines have spontaneously disassembled themselves! Luckily there's no friction in space, so we have time to fix them." "Actually, we're flying through a large blob of Space FrictionIn Space, we're going to stop in three seconds."
FNS Comet slows to a stop as it enters the system of Alpha Beta, but sends an unpowered probe toward a planet to study it from afar, which then brakes to a stop using space friction once in high orbit.
Averted: FNS Comet is bound by Newtonian physics so the ship continues moving towards its destination even when engines have stopped.
Enforced: Determining delta-V budgets and acceleration/deceleration times (among other things) in the mission is too much maths, so friction is adopted as an easier solution.
Lampshaded: Crew aboard the FNS Comet discuss how wrong Newton was.
Invoked: Snidley Wiplash has sabotaged the engines, making it so they can't be turned off, pointing the ship towards a nearby star, and destroying navigation control. Captain Bob orders Ensign Alice to go and physically yank out the flux capacitor, shutting off the engine so they'll stop short of the star.
Defied: FNS Comet's chief engineer explains at length Newtonian physics, their mission's delta-V budget and at what point they will need to start decelerating to arrive at a dead stop.
Discussed: "You wouldn't believe how often I hear, 'Why is the ship turning around? We're only halfway there!' "
Deconstructed: Space is treated as if it had an atmosphere, or was filled with a liquid.
Reconstructed: Space is treated as above, but the interactions of stars, spaceships et all are handwaved away through cosmic phlebotinum.