Frictional Force


Ms. Nighat Ali
26-Feb-2014
MADE BY MINAL AND NEHA.
VII-D

Friction

Friction is the force resisting the relative motion of solid surfaces, fluid layers, and material elements sliding against each other.


IMPORTANCE OF FRICTIONAL FORCE.

Friction is an extremely important force to meteorology. Not only does friction decrease the wind speed, it also changes the direction of the wind. Two types of friction occur in the atmosphere. One is molecular friction (friction between individual air molecules (called viscosity)) and friction between two surfaces (i.e. friction between air and land).Friction is far more important near the earth's surface then higher up in the atmosphere. When higher up in the atmosphere there are no longer trees, buildings, land surface, water surface, etc. to slow the wind down.


WAYS TO REDUCE FRICTIONAL FORCE.
Some of the ways to reduce friction include applying oil, use of ball or roller bearings, streamlining, and use of correct combination of surfaces in contact. Friction is the resistance that one surface or object comes across when moving over another surface or object.

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