The CK-12 Sims App allows you to view and download math and science simulations on your Android tablet. (At present, smaller devices such as phones are not supported.)
How to get the app
Click here or go to Google Play and search for "CK-12 Physics Simulations."
Click here, or go to the App Store on your iPad and search for "CK-12 Physics Simulations."
Downloading sims for offline use
Downloading sims for offline use is easy. Just click the download icon in the upper right corner of the sim you would like to download.
For more information on using simulations, see Getting Started with Simulations.