A didactical approach to the elliptical motion of planets in the solar system is proposed. The planets’ velocities in apsidal points and the total mechanical energy of the two-body systems are discussed and described as functions of orbital parameters. Kepler’s third law is obtained from energy and angular momentum conservation principles. […]
Understanding what the orbit of the Moon look like when viewed from the reference frame of the Sun presents some difficulties to highschool students. The approach described in this paper to the correct representation of the Moon’s trajectory is an example of how a physics problem can be schematized an simplified. […]
The article describes a school activity in which two different explanations of why airplanes fly are compared and discussed. […]