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DT revision
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- 1What is a non renewable energy source?A source of energy that will adventurly run out.
- 2What is a renewable energy source?A souce of energy that is sustainable and will never run out.
- 3Give an example of renewable energy source.- Solar power
- Wind power
-Hydro-electricity
- Bio-mass - 4Give an example of a non renewable energy source.-Fossil fuels
-Nuclear fuel - 5What isa negative of renewable energy sourcesThey do not exert as much energy as non renewable energy source so you need more, they're also more expensive.
- 6What are modern materials?Modern materials are materials that have been manifactured to have improved properties.
- 7Give an example of modern materials.- Metal Foams
- Graphene
- Nanomaterials - 8What are smart material?They are materials that can change when introduced to a certain factor I.E. heat and light
- 9Give an example of Smart material and what they do.Thermochromic pigments - They can change colour depending on the heat of the material. (Thermo means heat)
Photochromic pigments - They can change depending on the ammount of light avalible. - 10What are technical textiles?Fibers that are taken from a harder materials like composites and are fredded into fabric I.E. Kevlar, Fire-resistant fabric
- 11What are composites?Composites are when you combine two materials into one.
So it will have the properties of the two material.
I.E. fiberglass, Carbonfiber. - 12What is a ferrous metal?They are a type of metal that contains iron and has a very high melting point.
- 13What is a non ferrous metal?They are metals that do not contain iron and is not magnetic.
- 14Give an example of ferrous and non ferrous metals.Ferrous - Cast iron, mild steel, stainless steel
Non ferrous - Aluminium, copper, zinc and silver. - 15What is an alloy?A mixture of 2 metal - usually the best properties of each metal.
- 16Give an example of an alloy.- Brass
- Bronze - 17What does malleability mean?How easily the metal can be bent, hammered or pressed into a shape.
- 18What does ductility mean?The ability to be stretched without breaking.
- 19What does hardness mean?How easily you can cut, scratch and wear away the metal.
- 20What does elasticity mean?How easily the metal will return backto it's origional shape.
- 21Name three types of wood.Hardwood, softwood and Manufactured Board.
- 22What are the properties of hard wood trees?They are usually broad leaved
trees. - 23Are hard wood trees faster or slower growing that soft wood trees?Hard wood are much slower growing.
- 24What are the properties of soft wood trees?The are usually evergreens, Whixh means they do not lose there leave in the winter.
- 25What are manufactured boards?They are layers of wood fibres glued together.
- 26What are natural fibresThey are fibres that come from animals or plants.
- 27What are synthetic fibresFibres that are made by people usually using oil or chemicals.
- 28Name three different types of board.-Corrugated
Cardboard
-Duplex board
-Foil-lined
board - 29what are duplex board best used for?Food packaging
- 30What are thermoset Plastics?Plastics that you heat to mold a shape
(Once cooled they canno be reheated to create a new mold) - 31What are thermoplasticslastics that you heat to mold and make shapesout of but can be reheated and reshapes.
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- Fichas sobre DT revision, creado por Cameron Morton el 07/11/2021.
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- Cameron Morton
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