Fun with springs - Hooke's Law

The idea for this experiment came from learning about forces in school. I wanted to make an experiment to share my new knowledge with my class. This experiment is about seeing how much a spring will stretch if a certain amount of weight pulls from it. This is called Hooke's law, after the scientist that first proofed this concept, Robert Hooke. Procedure I attached a spring under a table with a hook at the end, so that I could hang different weights. I also fixed a ruler to the leg of the table to do the measurements Then I created different weights by putting water in a bottle for specific amounts of weight. For reference 100 ml of water is 100 grams. Next I hung the bottle and measured the amount of stretching on the spring from its original position I made note of the measurements in my notebook and then put them on a graph I discovered that the points formed a line. That's very interesting! That made me think, can I use this graph to predict what will happen if I hang any w...