Hi all, I have a general question about board breaking. This is not homework. Can anyone explain why it hurts more not breaking the board, compared to breaking the board. I know that there are already threads about this topic. However, I am confused about the different explanations: 1. If the board doesn't break there is a very large decrease in speed, causing the resulting force to be much larger. 2. No energy is used in deforming the board. Therefore are larger amount of energy is absorbed by the hand. Can anybody explain to me how these explanations can be linked, or if they are wrong. I'd really like to understand this in context of Newton's third law.