brittle - endures little strain before reaching breaking stress, elastic behaviour - it will return to its original shape after deforming forces are removed, elastic stored energy - energy stored in an object when it is stretched, Equilibrium - resultant force + turning moment = 0, Newton first Law - a body will remain stationary or move at a constant velocity unless acted upon by a resultant force, Newton Second law - force is directly proportional to the rate of change of momentum and acts in the same direction, Newton third law - If object A exerts a force on object B, then object B exerts an equal and opposite force of the same type on object A, tensile strain - ratio of an object's extension to original length, tensile stress - force acting per unit area, stiffness - how difficult it is to stretch an object,

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