Ok so I'm in a Physics class and there is going to be a Cardboard Boat Race competition. So I have to build a boat out of cardboard for two people to fit in and it be able to float across a length's pool. I just want to know how you would find out if a boat that I build out of cardboard would float with 2 people in it. My teacher hasn't taught us anything about these kinds of physic concepts, but she said it has something to do about buoyant forces. So my question is how do I determine if the boat will sink or not? Instructions on what I should do? Any ideas?