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Explain Kinetic friction. Write laws of kinetic friction. Define coefficient of kinetic friction. |
Answer» SOLUTION :Whenmagnitudeof FORCEACTINGON objectlyingon surfaceexceedsmaximumstaticfrictiontheobjectwillstartmovingin directionof externalforce. Hence valueof frictionforcewillreducelessthanmaximumstaticfrictional force. Frictionalforcewhichopposes relative motionbetweensurfaces incontactis calledkineticfrictionit isdenotedby `f_(x)` LAWSOF kineticfriction (i)Kineticfrictiondo notdependon area ofcontactbetweensurface (2)kineticfrictionforcedo notdependon relativevelocityof objectin motion kineticfrictionforceis PROPORTIONALTO normalforce `mu_(k)=`coefficientofkineticfriction`mu_(k) =(f_(k))/(N )` ifextermalforceappliedis reducedto zerothenaccelerationof objectwill bebe `-(f_(ik))/( m)`Henceitwillstopaftercoveringsome distance |
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