08-02-2022, 03:00 PM
(08-02-2022, 02:45 PM)josemendez Wrote: Gravity in this case acts in a direction that's completely perpendicular to the rope's longitudinal axis: it will not affect momentum along the X axis in the slightest. What I mean when mentioning gravity, is that ropes are usually attached from either end to an object and tend to fall down and lay in a vertical fashion, so any momentum gains are quickly dissipated.
The floor won't affect horizontal momentum either, unless you use a collision material with non-zero friction. So this is still behaving exactly like (or very close to) the original scene since both external forces act in an axis that's perpendicular to the momentum.
What is your use case exactly? Maybe I can give more specific pointers if I know what you're attempting to do.
Unfortunately in my case the rope is blowing up... That's why I try to make a simple example with a free rope floating in the air which showed the unrealistic behavior that I described above. But, thanks to your answer, I understand this behavior.
By the way, my "real case" is a rope which is attached to a boat and floating in sea (I made a system which compute buoyancy and drag force against the wave for each particles).
Do you think that increasing the rope from the boat should change the moment little enough to prevent this kind of behaviour ?