How does a Prusik knot function in rope systems?

• A. It acts as a friction hitch that grips the rope when loaded and slides when unloaded, enabling ascent or backup belay.
• B. It creates a fixed loop that cannot be moved.
• C. It is used to tie two ropes in a bight.
• D. It is used as a stopper knot.

Answer: (A)

Prusik knots function as a friction hitch in rope systems. They grip the rope when loaded and slide when unloaded, making them ideal for ascending a rope or serving as a backup belay. The knot is formed by wrapping a loop of cord around the main rope with several turns; when you apply weight, the wraps press against the rope and create enough friction to hold tension, so the knot locks in place. When the load is released, the friction decreases and the knot can be slid upward or downward along the rope, allowing you to reposition yourself during ascent or to adjust the setup. This adjustable grip is what makes it suitable for prusik ascents and for use as an automatic backup in belays or rescue scenarios. It isn’t a fixed loop, nor is it used to tie two ropes together, and it isn’t a stopper knot.