system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Terminal Velocity

Why do we stop accelerating after a certain speed?
gpt
The force of gravity is (roughly, if you're close enough to the surface of the Earth) constant. The air resists you moving through it, however, and this force of air resistance increases with your velocity. There's a velocity where the force of air resistance is the same size as the force of gravity; the net force on you is then zero, so you don't accelerate. This velocity is called terminal velocity.