We worked on uniform acceleration and unbalanced forces and how you can translate between knowing about the forces on an object to knowing about the motion of an object. We did it using whiteboard speed dating, another thing I learned from Kelly O'Shea. It's great; it forces the kids to move. It makes sure that ideas spread around the room. It requires students to wrestle with how other students represented the work. We did whiteboard speed dating for the entire 100 minutes, and we never got tired of it.