N

Working end: the part that moves when you tieStanding part, clamped in the balance's jawThe knot's path, broken where it passes underEach knot is laid on the bench the way it is tied, then set: the post draws the eye away until the balance reads 30 N, and the rope finds its own shape under load. The rope is simulated: every 3.6 mm of it is a ball that keeps its spacing from its neighbours and one rope's width from every other ball, sits on the bench by friction, and grips where it touches itself. Double-click the rope to pin it to the bench.