Air track

An air track is a scientific device used to study motion in a low friction environment.

Carts which have a triangular base and fit neatly on to the top of the track are used to study motion in low friction environments.

Since there is very little energy lost through friction it is easy to demonstrate how momentum is conserved before and after a collision.

It was first presented by them ([2] in the form of an air trough) at a meeting of the American Physical Society in NYC in 1965(?)

where it was viewed by Prof John Stull, Alfred University, and Frank Ferguson, the Ealing Corporation.