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When discussing technology of instruments, sensors and observing systems, as much as possible we follow the categories of WMO, World Meteorological Organisation, laid down in the Manual on Instruments and Methods of Observation.
Lubricants, use of either spherical or circular surfaces and ball bearings remove the hindrance in the way of free motion. The actual friction between the rails and the wheels gives motion to the train; while walking, friction between our feet and the ground is a necessary condition of forward motion. Momentum is the quantity of motion in a moving body.friction is used to stop cars, trains and other vehicles in motion. The amount of momentum depends upon the amount of matter or mass of the object and its velocity. It expresses the ratio of the density or weight of a unit volume of substance to that of water or other standard substance.