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Noll, Ellis D. – Physics Teacher, 1996
Presents a derivation of Kepler's Third Law for elliptical orbits that requires students to have a knowledge of angular momentum and conservation of energy. (JRH)
Descriptors: Astronomy, Conservation (Concept), Physics, Secondary Education

Mancuso, Richard V.; Long, Kevin R. – Physics Teacher, 1995
Presents the Astro-Blaster as a method of the laws of conservation of momentum and energy during the creation of a supernova. Several elastic balls are aligned for a drop, followed by multiple collisions which result in the top ball reaching tremendous heights relative to the drop height. (JRH)
Descriptors: Astronomy, Conservation (Concept), Elementary Secondary Education, Energy