Airtrack: Long track with two gliders coupled by a spring hoop.

AirTrack: Masses coupled with circular Spring. Two Air Track gliders are coupled with a weak spring consisting of a hoop of clockspring. Gliders are drawn apart so that the clockspring hoop is extended to about 45 cm. Gliders are then released. The sum of their momenta remains zero.
UCB Index: 
A+35+35
PIRA Index: 
1N20.25
Demo Diagram: 

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