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The programme reviews the ideas of classical mechanics which are the basis of an understanding of solids, liquids and gases.
Metadata describing this Open University video programme
Module code and title: ST285, "Solids, liquids and gases"
Item code: ST285; 01
First transmission date: 03-02-1973
Published: 1973
Rights Statement:
Restrictions on use:
Duration: 00:24:08
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Producer: Andrew Millington
Contributors: Al Baez; Mike Pentz
Publisher: BBC Open University
Keyword(s): Classical mechanics; Conservation of energy; Force and displacement; Force and potential energy; Galileo; Gases; Gravity; Liquids; Pendulum; Solids
Subject terms: Force and energy; Motion
Footage description: Computer animated film shows a molecular model of a solid at 0 degrees Kelvin. An incoming particle provides energy to the solid. The atomic array takes on the characteristics of a liquid, then a gas. Al Baez begins his discussion of Newton's laws of motion and the laws of conservation of energy. He uses a large pendulum to demonstrate changes from potential to kinetic energy. Baez then uses the pendulum to illustrate the equation: force x time = change in momentum. He then strikes the pendulum with a bat to demonstrate all three of Newton's laws of motion. Baez discusses inertial properties of a ball on earth and on the Moon. Film shots of Apollo astronauts hitting golf balls on the moon. Baez briefly discusses Galileo's work on motion. He uses several diagrams to illustrate his points. Baez vibrates two systems, a pendulum and a spring loaded puck. The two vibrate with the same period. He then performs the same experiment, this time simulating the gravitational conditions on the moon. The two systems now vibrate with different periods. Mike Pentz uses an air cushioned track along which objects can glide to simulate molecular motion in one dimension. He explains and demonstrates what happens when objects collide on the track. Pentz repeats the experiment, this time on an air cushioned plane surface. He demonstrates that an object, once in motion, will continue to move in a straight line. Film shots of Apollo 16 astronaut during a space walk on the return journey from the moon. Baez provides commentary for an experiment in which an elastic ball strikes a hard surface. Film shots show the ball bouncing up and down. Baez explains this motion in terms of potential and kinetic energy and then in terms of forces. Baez with the pendulum experiment apparatus explains and demonstrates how such an experiment can be made quantitative. He measures force and displacement. Film shots of computer animated simulation of molecular motion. Particles are shown with vector lines to indicate their direction and velocity. Several particle collisions are seen. Mike Pentz demonstrates an experiment which shows the relationship between force and potential energy. He vibrates a spring mounted system and monitors force and displacement. A potential energy curve is calculated and displayed. Pentz then uses a force curve for the system and the potential energy curve to explain energy changes in the vibrating system. Pentz uses a model to demonstrate the interaction between two atoms. The force/extension curve which results is shown on an oscilloscope screen. Pentz sums up.
Master spool number: 6HT/70712
Production number: 00525_5027
Videofinder number: 678
Available to public: no