Question

give reason for the following without friction it would not be possible to tie a knot why?

Answer 1

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My immediate answer was "yes" because there was no friction. But then I thought about it some more. Sliding of a knot on a rope requires two things to happen. One thing is overcoming the friction of one piece of rope rubbing against the other. This would be a non-issue in a frictionless rope. However, the rope itself needs to internally bend in order for the knot to travel down a rope. If this rope is only frictionless on the outside surface, it is safe to presume that it still takes force to deform the rope (unbend in one place while bending in another) and it would not be possible to effortlessly slide it along the length of the rope.

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