Monthly Archives: October 2010

Logic Circuits

We have covered the truth tables in class for: AND    OR    and    NOT    gates Here they are to refresh your memory Look at this. Can you write a truth table for this circuit? See me for … Continue reading

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A New Spin on Projectiles

A woman goes back to work after forty years. Here’s a change from kicking balls off cliffs – for a four-second laugh – no physics, I promise, check this out… By way of explanation, old-fashioned typewriters had something called a … Continue reading

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Testing is Good For You

It really is. Various international educators are in agreement that testing is a great way not just to learn new stuff but to apply what you know.  Year 10 did their CATS tests recently, I took a few of these, … Continue reading

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Energy Transformations – The Myth of Sisyphus

Sisyphus was famed as the craftiest of men. He was nasty, deceitful and greedy. As a punishment from the gods for his trickery, Sisyphus was made to push a huge rock up a steep hill, but before he could reach the … Continue reading

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Renewable and Non-renewable Fuels

All life on earth gets its energy from the sun. Plants and animals can store energy and some of this energy remains with them when they die. It is the remains of these ancient animals and plants that make up … Continue reading

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Centre of Gravity

    The centre of mass or is the mean or average location of all the mass in a system. In the case of a rigid body the position of the centre of mass is fixed in relation to the body. For example the … Continue reading

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Four Factors Affecting Resistance

Resistance is a property of a DEVICE or a COMPONENT. like a lamp, a resistor, a thermistor, a diode and so on. Its value depends on four things. 1. What it’s made of. Metals are good conductors so have lower … Continue reading

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