Hello Ludivine,
That’s an excellent question, essentially, it’s due to the material it’s made of. There’s three distinct kinds of material when it comes to electrical properties. In summary, there’s insulators, which resist the flow of current, conductors, which only slightly resist the flow of current, and semi-conductors, which do a little bit of both depending on the conditions they’re exposed to. Essentially, as the amount of tensile load increases on this fabric, it slightly changes in resistance, this is due to both the length of the path changing, and the material properties of the polymer the fabric has been coated in. You may be interested in the video below on this topic.
