Testing out Santa's Sphero sleighs

In library class 5th grade has been working on building Santa Sleighs out of recycled materials. Today they got to test them out with Spheros for reindeer! We learned that running on the carpet causes friction which slows things down, that it's good to have your reindeer closer to the sleigh, that a smaller sleigh is easier to pull but carries less presents, and that it's hard for ONE Santa to drive many sleighs!