Slow your roll

If you're not following Frank Noschese (@fnoschese) on Twitter, why even be a physics teacher with a Twitter account?

And if you get useful mileage out of constant velocity buggies (such as these from Arbor Scientific) but wish you had a convenient, reliable way to curb their enthusiasm, Frank tweets this:

These homemade battery spacers are amazing! Better than anything else I've tried (foil, paper clips, etc) to make a slow moving buggy.
* One flat-head machine screw (#6-32 x 2"))
* Two fender washers (1/8" x 1")
* Three #6-32 hex nuts#iteachphysics #modphys pic.twitter.com/r5gCvpSGJw

— Frank Noschese (@fnoschese) October 25, 2019