1. The problem statement, all variables and given/known data I need to proove that temperature changes make objects break. I used a stone, and heated it for about 10 minutes. After that I put it in cold water. According to my teacher that should've broken the stone, but it didn't. I had to give it a few hits, not too many or too strong, with a hammer until it broke in half. Why does this happen? I know it's because it expands and then contracts too fast, but I don't know what physical terms I need to use or a physical explanation.