I will teach children for a week, in a room that only has a projector. No whiteboard or blackboard. I am therefore looking for the best application for an iPad that I can use to draw on interactively, to show them what sort of experiments they will do, the theory behind in, and how they are going to do this.
I mainly need something that functions like a plain whiteboard app, does not need to be fancy. I would appreciate recommendations of good free applications and also some information on what applications are the absolute best for this (regardless of price).