My question is:Why is it more accurate to suppose that a sheet of glass will break, after being hit by a projectile with a given momentum, than suppose that it will break after receiving an impact force of f, or an impact energy of E
https://www.youtube.com/watch?v=OjvCNDF4RYw I watched this video and tried to solve the problem, i once found the equation in an excel spreadsheet but i cant found the spreadsheet.
In the equation i calculated at what momentum does the sheet break.
What surprised me is that glass generally breaks at a given momentum, not at a given force or impact energy. The error of nasanerd was calculating energy. I once did a experiment with a tiny glass plate, i put about 3 kg on it and pushed my finger with little force on the weight and it broke only after i did it, then i put about 7 kg slowly and it broke only when i pushed the weight with my finger, of course if i put 50 kg force on the glass it will break.