I haven't had physics and want to measure tensile failure in hairbands (I'm a girl) by suspending weight from them until they break. I've figured out that I can't measure ultimate tensile strength or breaking strength because I don't have cross-sectional areas (I'm comparing styles). So can I accurately measure tensile failure using the load/weight until they break (in kg) and then convert to N? Do Newton's laws apply? Also, I am confused if I m only measuring weight because it is being pulled down in one direction or am I measuring force, which pulls in two directions?