Okay, I am working on my physics lab, and I have a few questions regarding it. First, we are asked to make a prediction: "Predict how you think the presence of a rubber band will affect the force felt by the force probe from the rubber band compared to masses hung directly from the hook?" My lab partners and I thought that the force wouldn't transmit perfectly, because the rubber-band would pull upwards. Our data proved that that wasn't the case. Was are prediction truly wrong? Or, perhaps, did we set something up wrongly? Also, say I have a rubber band, and I hang it from some hook; I measure its length, and then I put some weight on it, and measure it again. How would I write the amount of stretch as a percentage?