Universal Gravitation

Duration: 12:00

Year Published: 1960

Complete Record: Subject: derives the law of universal gravitation by using imaginary ‘Planet X’ that is the only planet of a single star. Describes the process by which this law was developed. Presents the concept that motion is relative to point of view and demonstrates this through the motion of tow connected frictionless pucks of different masses. The kinematics and dynamics of planetary motion are demonstrated using a large turntable as a model of the solar system. Uses a digital computer and oscilloscope to show why the orbits are elliptical and that the ratio of the average distance covered to the time squared is constant. Relates these discoveries about ‘Planet X’ to the earth and credits Newton with our laws of gravitation. Demonstrations by J.N.P. Hume and D.G. Ivey, University of Toronto. Shots: scientists doing demos, experiments, pointing to blackboards. Derives the law of universal gravitation by imagining a solar system of one star and one planet. The kinematics and dynamics of planetary motion are demonstrated with models. Satellite orbits are displayed from the digital computer.