This week we did the trebuchet which is a type of catapult. I noticed that it didn’t go as far as you would might have thought. I think it was because at the start we only put in one weight. So it didn't go that far. But when we put more weights in it started to go 20 plus metres. But it still didn't go as far as you might think. I wonder why it didn't go as far as you might imagine. I am multistructural because I know what we were doing, but I don't know why we did it at the time.