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Each of the CK-12 physics simulations start with an introductory animation that explains the concept being demonstrated. After watching the demonstration students can play with a set of variables to see the effects of changing those variables. For example, in the archery demonstration students can change how far a bow is drawn to see what affect that has on the speed of the arrow. After experimenting with variables students can click the "challenge me" button to view a set of questions that ask them to utilize the information they learned through the simulation.
Interesting simulations! Thank you for offering this. Our school uses explorelearning.com which has a large number of simulations and learning activities to go along. This is a paid service but has been a valuable part of our science education. I'll bring your site up at our next staff meeting.