When teachers attempt to exert control with no real grounds to do so, things get messy, fast. In this case, a physics teacher demanded his students plot the graph for an experiment as they went along, despite not knowing the range of values upfront. OP, who was a part of the class, realized that even though this teacher had no clue what he was doing, he and the rest of the class would have to comply. The experiment in question included demonstrating the young modulus, where you would expect a s…