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.