system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5 : Why does pinching a hose at its extremity make the water flow faster while pinching in the middle make the water flow weaker?
gpt
because it reduces the volume moving past that point while increasing the speed due to the pressure behind.

When you pinch in the middle, the volume is restricted, but then expanded again, meaning the rest of the hose has reduced pressure and volume, due to the expanded area.

If you keep the hose pinched all the way along from the first pinch point to the end, the water will flow faster (but you'll have increased friction all along that stretch which will slow things down a bit).