Flashcards
Sem título
Flashcards do conjunto (19)
- 1sugget a product that needs to be... a) hard b)tougha) hammer
b) armour/ bullet proof vest - 2What product is strength important?-Bridge
- 3What factors are important when choosing the material to build a garden chair?- non-corrosive
- strong enough to hold a human weight
- fit on with the environment - 4Why is it a good idea to reuse and recycle metals?RecyclingL: uses less energy and produces less pollution
Reusing: means finite resources won't run out, e.g. metals - 5Why is it a good idea to recycle and reuse metals?recycling metals uses less energy than extracting them from the ground.
Reusing means the earths supple will not run out. - 6How dose annealing metal change its properties?heating the metals and leaving it to cool slowly. This makes is softer, more ductile and less brittle.
- 7Why is the metal of a car body is painted?Made from steel so which can rust so the paint prevents the rusting.
(red oxide, zinc chromate) - 8Why is copper a good to for a the wiring of a kettle?soft, malleable and a good electrical conductor.
- 9What is an alloy?mixture or two or more metals
- 10Why is metal a solid in a range of different shapes?it is very difficult to convert one shape to another
- 11Why are thermosetting plastics non recyclable?hard and ridged so they can't be remoulded.
- 12why don't plastics need a finishes?because the plastics finished is engineered into it when it is moulded.
- 13name a soft-wood?pine, cedar ad yew
- 14Give one advantage and one disadvantage of using carbon-fibre reinforced plastic instead of glass-reinforced plastic...Advantage- lighter, stronger and tougher
Disadvantage- more expensive - 15What is a special property dose nitinol have?shape memory alloy
- 16What is one use of nitinol?glasses frame.
- 17how can a product be improved by using nanocomposite?bike frame
- 18Why are some people worried about the enivromental impacts of nano-composite?because it is new and may have long-term risks.
- 19What are the advantages of pivot hinges?allow you to lift a door off its frame.
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- FlashCards sobre Sem título, criado por bee1999 em 06-06-2015.
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- bee1999
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