In this Outdoor Recreation video tutorial you will learn how to tie a Prusik friction knot. In case someone has fallen into a crevasse or you want to get back on a rope, Pruisk knot is required. It is used to tie two ropes of different diameters. It basically puts a loop of cord around another rope. It is named after the Austrian mountaineer, Karl Prusik. For making the knot, take the fixed loop made on one rope and pass it around the other rope and back through the fixed loop itself. Then loop it around two more times from the inside, each time cleaning up and dressing the knot ensuring that it doesn‚Äôt criss-cross. Your Prusik knot is ready.