I understand what these points are, but I'm struggling to identify E and Y on certain graph shapes.
With graph B I can identify Y, but there doesn't seem to be a clear elastic limit between P and Y.
With graph C there doesn't seem to be a clear yield point or elastic limit, so I'm not sure where I would place them.
Graph D doesn't follow Hooke's Law at all, so there is no limit of proportionality. In this case, where would the elastic limit and yield point go?
Note: This is not a specific homework question, in case anyone thinks the question is too specific. This is a general question about the placement of points on a graph that I need to be able to do for my A-Level course.