The Air Track as a teaching apparatus is extended by
changing the mass of the gliders. This set of four equal
105 gm masses allows an increased range of
experimentation with conservation of momentum in
elastic and inelastic collisions. Screws and wing nuts are
included for attaching the masses to the gliders. Attaching
two of these masses to an unloaded 15-cm Science Source
glider doubles the mass of the glider.