Electro Statics
Explain the following:
1) Nylon clothing crackles as you undress.
2) In dry weather, people walking on clean carpets may a shock if they touch a radiator
3) Passengers sliding off a car seat on to the ground sometimes get a shock
4) Petrol road tankers usually have a length of metal chain hanging down to touch the ground.
5) A rubbed balloon will stick to the wall for some time
6) A mirror or window polished by a dry cloth on a dry day may become dusty.
7) As sellotape is pulled of a roll it is attracted to your hand.
8) When spraying an object with paint, less paint is wasted if the object is charged
9) A TV screen becomes dusty
10) The amount of smoke leaving a factory can be reduced by placing a charged object in a chimney
Friday, January 18, 2008
Tuesday, January 15, 2008
y8 Joule
Weathering of the Elms
The oldest part of The Elms was built in 1735 for Sir Joseph Ayloffe. When it was built Acton was a small country village surrounded by fields.
How old is The Elms?
Describe the changes that have occurred in Acton since the Elms was built.
In contrast the Sports Hall was built in 1994.
We are going to look at the state of bricks in the two buildings.
The Elms
Some of the brickwork has been replaced so you must try and find an original brick.
Sketch the brick that you have chosen below.
Label features such as small holes and cracks. Is there any evidence of plant life such as moss or green/grey crusty lichens?
Look at other bricks, are they similar to the one you have drawn. Are there other features that you think are worth mentioning? Is the wear more noticeable parts of the building more exposed to the weather.
If there is time you can sketch another brick from the north side of the building.
The Sports Hall
Are any of the features seen in the bricks on The Elms visible in the bricks of the sports hall?
What reasons can you think of for the differences?
When The Elms was new do you think the bricks looked as they do now?
What could account for the change in surface of the bricks in the Elms?
Keywords
Chemical weathering, abrasion, smooth, rough, surface, cracks, flakes, breaking off, ice, snow, wind, sun, rain, heat, expansion, contraction
The oldest part of The Elms was built in 1735 for Sir Joseph Ayloffe. When it was built Acton was a small country village surrounded by fields.
How old is The Elms?
Describe the changes that have occurred in Acton since the Elms was built.
In contrast the Sports Hall was built in 1994.
We are going to look at the state of bricks in the two buildings.
The Elms
Some of the brickwork has been replaced so you must try and find an original brick.
Sketch the brick that you have chosen below.
Label features such as small holes and cracks. Is there any evidence of plant life such as moss or green/grey crusty lichens?
Look at other bricks, are they similar to the one you have drawn. Are there other features that you think are worth mentioning? Is the wear more noticeable parts of the building more exposed to the weather.
If there is time you can sketch another brick from the north side of the building.
The Sports Hall
Are any of the features seen in the bricks on The Elms visible in the bricks of the sports hall?
What reasons can you think of for the differences?
When The Elms was new do you think the bricks looked as they do now?
What could account for the change in surface of the bricks in the Elms?
Keywords
Chemical weathering, abrasion, smooth, rough, surface, cracks, flakes, breaking off, ice, snow, wind, sun, rain, heat, expansion, contraction
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