#### All about conic sections

This is a fully interactive program allowing many useful ways of investigating conic sections both visually and algebraically. It comes with a full set of explanatory notes for both teacher and pupil.

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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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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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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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A short clip showing the experimental measurement of the speed of electrical pulses in a cable - a large fraction of the speed of light.

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A presentation showing how to measure the speed of sound over a short distance on a laboratory table.

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The concept of oxidation and reduction is explained and generalised using oxidation numbers with ionic and covalent examples. Several equations are balanced, using the oxidation number method to fix various atomic ratios.

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