PURPOSE: To demonstrate conservation of energy and conservation of momentum in elastic collisions.

DESCRIPTION: Air track gliders with rubber bank bumpers are setup on a frictionless track are used to illustrate elastic collisions. This may also be done on a dynamics track with magneticly repelled cars. The air track is the better option. A motion senor and datastudio may also used. Massed can also be used to vary the results.

SUGGESTIONS: Practice may be necessary.

EQUIPMENT: Air track, gliders, two each mass M, 2M, and 3M.

SETUP TIME: 30 min.

KEYWORDS: elastic collisions conservation of energy conservation of momentum