Recently I built a cardboard boat for my physics class. Part of the report asks for real-world applications of the physics used in building a cardboard boat, or the applications of the knowledge learned in general. What are some applications related to cardboard boats?

Funny place to post this. I presume you know your tutor isn't talking about computer applications? But how do physics "Apply" to cardboard boats. The main one would be that the cardboard boat floats because it displaces water that is more than the weight of the cardboard hull. This sounds simple but is the basis of all shipbuilding. In the second world war there were concrete hulls made for some pontoons in the English Channel, if it wasn't for this calculation no one would have thought it possible.

Regards, Image F/X