Monthly Archives: September 2008

Resonance

Resonance occurs when a driven oscillator is made to vibrate at the same frequency as a driver oscillator. Resonance effects are characterised by vibrations with large amplitude. Here is a link to  Barton’s pendulum. You will see this in class Think … Continue reading

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Mass-Spring Oscillator (updated)

Read the IG post on Hooke’s law before proceeding. Check out a Mass Spring Oscillator as a moving .GIFIn order for mechanical oscillation of a mass/spring system to occur, it must possess two quantities: elasticity and inertia. When the system is displaced from its equilibrium … Continue reading

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Music of the Spheres

Musical appreciation has much to do with agreeable resonant frequencies. Pythagoras discovered relationships between musical notes. The pitch of a note being played on, say, a guitar depends on: The length of the string. The tension of the string. The … Continue reading

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Soap Chemistry

  It is hard to say when soap was first invented. Some suppose that even prehistoric man (or, more probably, woman) had a primitive form of it at their disposal. Whether the hunters and gatherers had soap is debatable, but it is … Continue reading

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Catalysts

…increase the rate of a reaction while remaining unchanged chemically themselves. There are two distinct processes… 1. The reactants are ADSORBED on to the catalyst surface, making it easier for the reactants to combine. The reactants like the surface of … Continue reading

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Alcohols

A surprisingly large number of common foodstuffs are produced by direct fermentation of yeast or similar microbes, or by using the principles of fermentation where sugars are digested by micro-organisms to form alcohols.               … Continue reading

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Linear Air Track: Measuring Acceleration (for IG and AS)

The trolley floats on a cushion of air on a V-shaped track, so there’s no friction to slow it down. When the light beam is interrupted by the passage of the trolley it starts a clock. The clock stops when … Continue reading

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