I'm an AP Calculus teacher, and I used the attached lab to introduce position vs. time graphs to my students. My school doesn't offer physics after freshmen year and historically students have struggled to translate graphs into the actual motion that they represent. This year, using PocketLab and some magnets, the students were able to create their own position vs. time graphs, and concept mastery has been significantly higher. I'm definitely planning on repeating this lab next year!
p.s. I've also shared this lab with our 9th grade physics teacher - she said that her students really benefited from the lab as well.