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Resistant Materials 01
What do insects and fungi do to wood?

Resistant Materials 01

This KS3 Design and Technology quiz looks at resistant materials. In the field of Design and Technology, 'resistant material' is the term used for materials such as wood, plastic and metal. To describe a resistant material, think about its physical properties, appearance and keeping qualities. A material that deteriorates or rots quickly or disintegrates when it gets wet is not classed as being resistant.

Physical properties of a resistant material are very varied. The uses to which they are put usually depends on these properties. For example, a material that is stiff, low density and strong could be used for making an aircraft. When making a lorry or crane, weight is less of an issue but strength is. Matching a material to the job it is designed to do is a very important part of D and T. But it is important to remember that most resistant materials won't last forever. Wood can be attacked by fungus and insects. Ferrous metals will rust and even plastics can be harmed by the UV rays from the Sun which will weaken them and can change their design properties.

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1.
A material with strong physical properties will .......
allow an electric current to flow through it
bend and stretch easily
carry a heavy load without breaking
weigh a lot for its size
Steel, acrylic and nylon are all examples
2.
A material with dense physical properties will ......
allow an electric current to flow through it
bend and stretch easily
carry a heavy load without breaking
weigh a lot for its size
Lead is very dense and it is used in the design of nuclear reactors to help to stop radiation from escaping
3.
Resistant materials that are designed to break down naturally are known as what?
Biocompatible
Biodegradable
Biodynamic
Bioenergetic
Designing biodegradable materials helps to avoid long-term pollution. Some resistant materials e.g. wood are naturally biodegradable
4.
Wood is ....... by insects and fungi.
attacked
corroded
discoloured
dissolved
Water is also a problem with some types of wood
5.
Materials are affected by their surroundings. Many metals are ....... by air and water.
attacked
corroded
discoloured
dissolved
Corrosion is a chemical reaction
6.
A transparent material is see-through. What is its opposite called?
Block
Hidden
Opaque
Solid
Translucent is in-between transparent and opaque
7.
Many plastics become ....... with age.
discoloured
liquid
rough
rubbery
They can also become more brittle
8.
A material with good thermal physical properties will .......
allow an electric current to flow through it
allow heat to pass through it
not bend and stretch easily
weigh a lot for its size
Metals are good conductors of heat
9.
What does 'ferrous' mean?
Containing or consisting mainly of iron
Material that can withstand extreme cold
Material that can withstand extreme heat
Wood that has been attacked by woodworm
Fe is the symbol for the chemical element iron
10.
A material with stiff physical properties will .......
allow an electric current to flow through it
carry a heavy load without breaking
not bend and stretch easily
weigh a lot for its size
These materials are good for making the framework of things
Author:  Frank Evans

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