For the buggy paradigm lab, I wanted the graphs to all look different so we could compare and contrast. To get some negative positions, I made a common origin out of tape and staggered the tables. I also made at least one group run their buggy the opposite direction so we could figure out the meaning of a negative slope on the position-time graph.
After collecting data, students graphed it on engineering paper and then whiteboards the results. Lots of aha moments during the board meeting!
Siebert Science 