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What is the definition of 'brittle', and name a brittle material.
- . Brittle materials break suddenly without derforming the solid physically.
- . Brittle materials are weakened by cracks in the material.
- . Ceramics, such as pottery and glass, are brittle materials.
What is the definition of 'ductile', and name a ductile material.
- . Ductile materials can be drawn into wires or other shapes without losing their strength.
- . Copper is a ductile material, as it is used for electric wires.
What is the definition of 'malleable', and name a malleable material.
- . Malleable materials can change shape, but may lose their strength doing so.
- . Gold and brass are malleable materials.
What is the definition of 'hard', and name a hard material.
- . Hard materials are very resistant to cutting, indentation and abrasion.
- . Hardened steel and diamonds are hard materials, and they are usually used for cutting tools.
What is the definition of 'stiff', and name a stiff material.
- . Stiff materials have a high resistance to bending and stretching.
- . Stiffness is measured by the 'Youngs modulus' (Pa).
- . The outer protective casing of construction helmets and safety boots are stiff materials.
What is the definition of 'tough', and name a tough material.
- . Tough materials are really difficult to break.
- . Toughness is a measure of the energy a material can absorb before it breaks.
- . Polymers, such as polythene (the material used to build kayak hulls), is a tough material.