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Question

state the laws of static and kinetic friction. Give advantage and disadvantages of friction and also give the method of minimising friction

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Solution

Dear student
1) Static friction operates when there is no relative motion between the surfaces of contact but the kinetic friction acts when there is relative motion between the contact surfaces.2) Static friction is a self adjusting force as it smagnitude varies as 0fμsNbut magnitude of kinetic friction remains constant fkinetic=μk×NDisadvatage of friction is that it causes wear and tear in the tyres,machines ,produces heat when a machine operates.Advantage is We can write on paper as it is the friction between the paper and the ink which holds together and we can writeWe cannot put nail on the wall in absesce of frictionWe cannot walk in absevce of friction.We can reduce it by lubrication between contact surfacesRegards

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