js graph library that lets you move points?

Ok so i am looking for a js library that allows me to actually interact with points on a graph, or the line of a linegraph, by moving the data points. My end goal it to create 3 graphs, position vs time, velocity vs. time, and acceleration vs. time. This is for a physics class to help people better understand how the graphs relate to one another. so moving one point on the graph effects the others. I tried doing this with NVD3, but I don't think it's possible. or at least not easy they don't have very great documentation. So my question is do you know of any libraries that do this easily without having to hack around with the code?