Physics says different. Ever tried to move a hose under pressure, then again without pressure?
The equal force actually means that it will attempt to straighten itself. The pressure will try to even out between the inside and outside circumference, thus causing a straightening motion.
Yes it will attempt to straighten itself but as I wrote, it is a relatively low force compared to the hoop stress. Consider flexible fire hoses, they run around 15 bar mains pressure (~200+ psi), running from appliance to building or a closed nozzle, they sit still when pressurised even though they are definitely bent or looped, plenty of videos out there. It moves around only when they open the valve and the mass of the water flowing is then a factor.
Edited by Lima31, 30 July 2020 - 10:39 AM.