Physics - Stress
Two types of stress that often exist within a structure are:
* Compressive stress  - when an object is being compressed.
* Tensile stress  - when an object is being stretched.
Both types of stress are calculated using the same formula.
When calculating stresses the force must be in Newton and the cross
sectional area must be in metres squared. Watch out for cases where the
dimensions rather than a cross sectional area are given for a cable, strut,
etc. These dimensions need to be converted into a cross sectional area
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