The vast Majority of these simulations are written in Java and Flash (not iPad friendly). However, the team at Colorado Boulder have started to remake them in HTML5 (iPad friendly) – see links below.
These are a fantastic resource which comes from a teams love of physics and teaching it. Really handy, useful and easy to use. Here’s what the team have to say:
PhET provides fun, interactive, research-based simulations of physical phenomena for free. We believe that our research-based approach- incorporating findings from prior research and our own testing- enables students to make connections between real-life phenomena and the underlying science, deepening their understanding and appreciation of the physical world.
icon-desktop Click Here (not ipad friendly)
icon-tablet Click here for ipad Friendly