Hello, I have an engineering project idea I hopefully would like to enter into a big science fair. I will need a physics Simulator that can show the effect of differing amounts of forces on 2 things joined by an electromagnet. Preferably free/open source or has a free student licence. If there is nothing free still link anything you know. Also do you have any idea if your allowed to use things like Inventor or other student licensed software for science fairs? Thanks for any answers.