Hello, I've been to a couple of towers in the world (CN and Blackpool) with specially build glass floors that you can safely walk/jump on. In each case, claims have been made stating that the glass is capable of withstanding a particular weight or pressure. Intuitively, I feel I would be more likely to break the glass if I stood on a box and jumped on to the glass, and I'd be even more likely to break it if I was to run up a ladder and jump on to the glass. I can understand in each of these scenarios how I would have a greater energy - but how could the weight or the pressure I exert on the glass be affected by this? Has the wrong statistic been used? Should the text have given the energy required to break the glass instead? Or am I missing something fundamental? Any ideas what would be required to break the glass and how close I could get to doing so on my own?