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Physics Key Skills assignment PHX1 Robert Moss Matter and Materials Part 1 Here is a list of definitions of important terms, with the sources of information in brackets: Tensile Stress (1) Tensile stress is the tensional force acting on a solid per unit cross-sectional area. It is represented by the symbol ? and is measured in N m-2 or Pa. (They are the same thing). Formula: ? = F / A Strain (1) The tensile strain is calculated by dividing the extension produced in a solid (i.e. a wire) under tension, by its original length. It is represented by the symbol ? and has no units. (It is a length divided by a length). Formula: ? = e / l The Young Modulus (1) The Young Modulus is a means by which we can measure a material's relative resistance to tensional force. If a material obeys Hooke's Law (as most of them do, at least to an extent) then the...

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