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Couple
A pair of forces that are equal in magnitude but opposite in direction and separated by a perpendicular distance
Moment of a couple
Force × Perpendicular distance between the lines of action of the forces
Centre of mass
The point in a body where the weight appears to act
Newtons first law
An object will remain stationary or moving at a constant velocity unless acted on by a resultant force
Newtons third law
When body A exerts a force on body B, body B exerts a equal and opposite force on body A of same type
Principle of momentum
Within a closed system the total momentum in any direction remains constant
Hooke’s law
The extension is proportional to the force applied provided the elastic limit is not exceeded
Tensile stress
Tensile force per unit cross sectional area
Tensile strain
Ratio of extension to its original length
Young Modulus
Ratio of stress to strain which is constant for a material