Vector: a quantity, which has a direction as well as a magnitude, e.g. force, displacement, velocity and acceleration.

Velocity: the rate of change of displacement, measured in m/s or mm/s.

Vibration: a to-and-fro motion; a motion, which oscillates about a fixed equilibrium position.

Vibration dose value (VDV): a measure of vibration exposure; the fourth root of the integral, over the measurement period, of the fourth power of the frequency-weighted time-varying acceleration; see also under eVDV and root mean quad.

Vibration isolation: the reduction of vibration and structure-borne sound by thhe use of resilient materials inserted in the transmission path between source and receiver.

Vibration white finger: blanching of the fingers and other symptoms caused by exposure to hand-transmitted vibration; see also under Raynaud’s disease.

Viscous damping: damping of the sort, which occurs in viscous fluid layers, in which the damping force is proportional to the velocity of the fluid element.

Volt (V): the unit of electrical potential; the difference in electrical potential between two points on an electric conductor which is carrying a constant electric current of one ampere (A) when the power dissipated between the points is one watt (W).