#### All numbers are not equal

An introduction to the various types of numbers which are recognised as important.

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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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An introduction into the writing down of fully balanced chemical equations. The process is explained starting with word equations, finding all the relevant formulas and then working with some useful rules for finding the correct coefficients in the b....

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A brief look at the Physics behind sending signals along cables and via geostationary satellites. An experiment to measure the speed of an electrical pulse in a cable is described and the Physics of the orbits of communcations satellites is develope....

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The main problems associated with communicating with distant space probes like Voyager 1 are investigated. The role played by diffraction in limiting the amount of power receivable on Earth is discussed. The further problems of reaching a nearby st....

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An introduction to constructing and recognising chemical formulas. Using 20 well-known elements, the valency-rules which govern the atomic ratios are explained and used with several examples.

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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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How can we make sensible estimates of very large numbers? It is often very important to know the size of an unknown number, at least to within a factor of ten.

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How can we represent fractions in the simplest way? Equivalence of decimal and common fractions.

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An approach to adding and subtracting fractions, using an understanding of the processes involved.

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Mutiplying and dividing fractions: a systematic approach to this perennial problem.

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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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