Not really a problem but a concept im having trouble understanding and I was hoping someone can explain to me better. We performed an experiment in lab last week on finding the Young's modulus of copper by projecting a laser on the wall to magnify the effect of the change in length of the wire. Our lab instructor told us that the precision of the experiment is NOT ruined from using a meter stick because that stress determines the order of magnitude. And that a small area means a huge stress cause of the relationship S=F/A. Can someone please explain this to me better why the experiment is not ruined from using the meter stick. Im still a little confused. Thanks alot!