#### A Quantum Gas

The quantum gas is an extreme state of an ensemble of atoms when their de Broglie wave length is of the same length as the size of the container. The ways of achieving this state are described and also how its temperature is defined.

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In finite objects, the total external force equals the total mass times the acceleration of a point called the centre of mass.

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A short video showing a simple classroom method of checking the way in which this force is related to mass, speed and radius.

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Uniform circular motion: angular displacement and velocity are introduced and centripetal acceleration is determined.

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A description and demonstration of the way in which craters formed by dropping objects into sand can be linked to some elementary physics

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The total work done on an object equals the increase in its kinetic energy. For conservative forces, we can define potential energy.

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A presentation showing both the ideas about centripetal force and a simple classroom method of checking the way in which this force is related to mass, speed and radius.

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The inverse square law explains planetary motion - and apples falling. Newton's law, measuring G, calculating orbits.

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Helen Sharman, the UK's first astronaut, gives a vibrant account of her personal experience of life in space using models and film to illustrate the key scientific concepts involved in spaceflight. Among other things she discusses the way Newton's Th....

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A few (surprising?) thoughts on how the wheels on a longboard or skateboard actually move.

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p=mv. If external forces are zero, momentum is conserved. In collisions, energy may be conserved (elastic) or not (inelastic).

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