When you want to present the results of your physical research, movies are often an appropriate means. The movie engine turns physical simulations into videos.
At first glance, the movie engine looks like the Physolator. Also the way you use it is similar - except that you are working with movies instead of physical systems: load a movie, start the movie, go back to the beginning, use the time slider to move forth and back inside the movie.
Every physical system with a graphical component can easily turned into a movie and run inside the movie engine. Besides that, you may also program movies by yourself. In this sense, movies are nothing but time dependent graphics components. Finally, you may compose movies. Build a sequence of movies where its parts are run one after another. Each part may either be a physical simulation or programmed movie.