Here are some videos, animations, and powerpoints on energy conversions.

Movie


    http://goanimate.com/go/movie/0v4MarjQ-Kj8/1
    Here is a animation on how energy is converted in roller coasters.

    http://goanimate.com/go/movie/0lcErlyZtRi4/1
    This is a revised version of the old movie. This one is more clearer but you can't read all of the info from time to time.