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The programme examines the importance of distribution of mass of a rigid body. Expressions for second moments of mass are worked out.
Metadata describing this Open University video programme
Module code and title: T231, Introduction to engineering mechanics
Item code: T231; 06
First transmission date: 20-04-1975
Published: 1975
Rights Statement:
Restrictions on use:
Duration: 00:23:16
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Producer: Andrew Crilly
Contributors: Dick Fendrich; Pip Youngman
Publisher: BBC Open University
Keyword(s): Cones; Dynamical problem; Energy storage; Flywheel; Moment of inertia; Rolling cylinders; Shape; Spheres
Footage description: Pip Youngman demonstrates the home experiment windlass. Richard Fendrich performs a simple experiment to demonstrate the importance of distribution of mass in rigid bodies. He rolls two roller one plain the other stepped, down an inclined plane. The plain roller accelerates much faster. Fendrich asks why this should be. Richard Fendrich, using diagrams and a board, works out the equations for the second moment of mass (moment of inertia) for a disc revolving about its centre. Several revolving bodies (spheres, cones, etc) are shown and the expressions for their second moment of mass are given. Richard Fendrich uses diagrams of the rollers to work out an expression for their second moments of mass. He uses this to predict the outcome of the above experiment and then demonstrates the experiment again. Richard Fendrich gives a short summary of the programme. Fendrich looks at several future possible practical applications of the principles discussed in the programme. Shots of diagrams of a power generator using flywheels to store and generate power. Also diagrams of a car motor run on the flywheel principle. Film shots of an Indian potter with a traditional wheel demonstrates the principle of second moment of mass.
Master spool number: 6HT/71513
Production number: 00525_5106
Videofinder number: 694
Available to public: no