In Dramatica Story Theory, if Physics is the Subjective Story Domain the Main and Obstacle Characters will be grappling over an activity. This could be an activity that is leading toward a purpose or just something engaged in for its own rewards. It might even be a detrimental activity engaged in as a means of punishing oneself to relieve guilt. Both Main and Obstacle may be striving to out-do each other at this activity, or one may be for the activity and the other against it. In any case, the activity lies at the heart of the difficulties between them and forms the subject of the story’s passionate argument if Physics is the Subjective Story Domain.

From the Dramatica Theory Book