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UNIT 1 ­ Mechanics and Materials (Definitions)
Breaking stress The maximum stress (force per unit area that can be applied to a material
before it is pulled apart (also called the tensile strength).

Brittle A material that shows no plastic deformation just beyond its elastic limit.

Centre of gravity The…

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Tensile stress The tensile force per unit area.

Terminal velocity Constant velocity of a falling object in which the force of gravity downwards
is balanced by the drag force.

Tough Materials that are able to withstand impact forces without breaking and require a large
force to produce a small plastic…

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