system
Given the following post, respond as if you're commenting on Reddit:
human
If you had a frictionless rope, would you be able to tie knots in it that would hold? Are there some knots that would hold and others that wouldn't?
gpt
That depends on what you mean.

If you take a rope, loop it through itself, and pull on both ends, that won't unravel. It will just get tighter.

But, if you take an end of rope, and tie it to something, eventually leaving the end free -- then you're relying on friction.

Same thing for taking two ends of rope and tying them together (eg shoelaces).