#### Communication on Earth, using Cables and Satellites

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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#### Simple and Compound Interest

#### Percentages

Making life easy when using percentages. A sometimes fraught topic looked at differently.

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

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

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#### Estimation – Educated Guesswork?

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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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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