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Physics Homework heat

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Introduction

Thursday, 8 September 2005 Physics Homework Conduction 1. 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. ...read more.

Middle

It also replaces water in the system as it is used. Hot water from the boiler collects in the storage tank. An expansion pipe serves as an overflow should steam or air bubbles build up in the system. 3. A radiator distributes most of its heat by being close to the floor allowing warm air to rise up from it, then a convection current is set up as cooler air sinks to the bottom of the heater, all air in the room is warmed as it circulates through the heater. 4. A freezer compartment is place near the top of a refrigerator so that cold air sinks away from it. Warmer air then rises to the top of the refrigerator where it is cooled by the freezer compartment. ...read more.

Conclusion

5. Radiation passes more easily into a greenhouse than out of it because the radiation from the sun is mainly of short wavelength so it passes easily through the glass and warms up the material inside, but these warm material radiate longer wavelengths that do not pass through the glass so easily. 6. The best emitters of radiation are also the best absorbers, making black a good emitter. 7. Kettles usually have a silvery mirror like surface to cut down the amount of heat wasted by radiation. 8. 3 ways a hot object may lose heat is by conduction, convection and radiation. 9. Heat loss is reduced in a Thermos flask by a stopper in the top to prevent convection, a part vacuum surrounding it to reduce conduction and a silvered surface to reduce radiation. ?? ?? ?? ?? ...read more.

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Response to the question

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 ...

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Response to the question

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.

Level of analysis

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.

Quality of writing

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.


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Reviewed by skatealexia 15/08/2012

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