|Edna fan art by @aldescery|
Julia was one of many physics teachers who asked, where did I obtain the rotating disk (from show #1) and the rotating platform (from show #4)?
Julia and everyone, I'm so glad you're watching!
The Pasco rotary motion sensor can make angular position, velocity, and acceleration vs. time graphs. I have the new wireless version, which works via bluetooth with my phone or ipad on the free "Sparkvue" app. That's what I used when I had the two objects connected by a string over a disk.
The rotational platform is a big investment. When we built our new science building in 2012, I had a nearly blank check to buy equipment - so I bought the Pasco complete rotational system. Just the base and the disk attachment would be enough. It's structured so that a Pasco-branded photogate can mount beneath the disk and measure angular velocity rather, um, more elegantly than I did on Monday's show. But I only have Vernier-brand photgates, which don't fit.
When I did my open lab for teachers a few years back, we spent a few hours taking a trip to the hardware store to create the $5 version of this rotation system. Get some 1/2 inch PVC pipe and two 90-degree attacher joints.* Make a "T" out of the PVC. Place the bottom part of the T over top of a securely-mounted ringstand... the top of the T will rotate pretty cleanly. You can wind a string around the PVC to provide a torque, just like I did on Monday's show!
*Can you tell from the language use here that I have no skills with hardware?