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# Re: [Phys-L] motion lab

• From: Bill Nettles <bnettles@uu.edu>
• Date: Mon, 23 Sep 2013 15:30:54 -0500

We use the "bubble sticks": clear plastic tubes filled with some colored hydraulic fluid and enough air to form a 1-2 cm bubble. Measure the time for the bubble to travel to position X after turning it over, plot X vs t. Slope is speed, y-intercept is the starting position. The speed is angle dependent. Challenge clever students to find the maximum speed.

-----Original Message-----
From: Phys-l [mailto:phys-l-bounces@phys-l.org] On Behalf Of Anthony
Lapinski
Sent: Thursday, September 19, 2013 3:12 PM
To: phys-l@phys-l.org
Subject: [Phys-L] motion lab

Does anyone do a "constant velocity" lab? Like using constant velocity cars
(Tumble Buggies)? If so, what do students measure (just d and t?)? Do they
make a graph? Cookbook or open-ended? Is it more about measuring than
finding the actual speed?

I'm looking for something low tech (for high school) and meaningful. Just
stopwatches and meter sticks. Wanting some ideas to make a "basic" lab like
this interesting...

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