ductility - the ability of a material to be streched, drawn or pulled without breaking. copper is ductile, elasticity - the ability to return to its original shape after streching or compression. lycra has elasticity, hardness - the ability to withstand impact, wear abrassion and indentation. tungsten is hard (knives, drill, saws), malleability - the ability to withstand bending and shaping without cracking or splitting. gold, copper, silver, lead, strength - the ability to withstanda forcesuch aspressure, compression, tension, shear. ca be strong in one force and not the other. concreate is strong in compression but not tension, toughness - the ability to absorb shock without fractoring. kelvar body armour absorbs impact,

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