Physics Homework heat

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Thursday, 8 September 2005

Physics Homework

Conduction

. When a material is heated, its molecules begin to move around quicker and each molecules bumps against those around it until all molecules are moving at a high speed. In this way, heat is conducted to all parts of the material. Most metals conducted heat well because they have free electrons.

2. Three good conductors of heat are silver, copper and aluminium.

3. The best material for a table mat would be something that insulates the heat so not to damage the table top such as cork, the best material for a saucepan base would be aluminium or copper because it readily conducts heat from a gas ring or a hot plate, and the best material for a handle of a kettle would be plastic so that as little heat as possible is conducted to your hand.
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4. Usually the poorest conductors of heat are liquids, such as water.

5. Fur, fibreglass and polyurethane foam are all good insulators because of the air trapped inside them.

6. A double glazed window consists of two sheets of glass with an insulating layer of thin air trapped between them.

7. Bike handles feel colder than their rubber/plastic grips because the grips are insulating the heat.

Convection

. In a beaker containing both hot and cold water, the hot water rises by convection to the top and the cold water sinks to ...

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Punctuation, grammar and spelling is done to an adequate level throughout. The form of the piece is split into easy to read sections with sub bullet points for each new point.

The candidate explains the scientific principles underlying the different methods of travel e.g. conduction to only a basic level and I think a little more scientific theory on collision theory should be seen to show better understanding and analysis of the concept. Uses of each explained well with a whole range of examples. The candidate should show how to prevent heat loss in a separate section of the essay as it is clumped in with radiation at the moment where it does not quite fit.

A piece of homework to be analysed. The candidate answers the question well, providing a range of uses for the different methods of conduction etc. The candidate needs to show a better understanding of the underlying scientific principles of the methods.