Why the cord break easily?

The benefit of the nylon cord is far safer than metal blade in comparison. However, if & when operator handled the brush cutter with nylon cord exactly same manner as with metal blade, nylon cord break quite easily. That must be because of the excessive burden is getting on the bottom of the nylon cord by swinging the head of brush cutter and hitting the grass by entire cord. You could enjoy the characteristic of the nylon cord when you try to hit the brass only by the tip area of the cord without swinging the head of brush cutter too much.