Do you teach graphing to your students? If so THIS one I found via Chris Craft and Steve Dembo is a great lesson complete with videos and plans. The idea that we can describe things that happen with mathematical graphs isn't new, nor is the idea that this is an effective introduction to a linear unit.
What this teacher did (in his own words)
He has the lessons, description AND videos on his site--check it out, I know I will be following it.
I went out and taped ten events. They were simple. I walked down two flights of stairs. I ran up a hill. I drove my car. Each event was exactly fifteen seconds long.
I put a handout on every student’s desk with a graph ready for each event.
I played each event and then paused the video. I asked questions like, “When the clock started, was I up high or down low?”