cycles with flat tyres is difficult to ride since internal pressure reduces so the round shape is distorted so rotation of wheel is not possibleif u want an answer why is it said that friction does not depend on surface are of contact
then u might want to have a look a this eqn
friction =coeff of friction*normal force.
coeff is const for two surfaces and normal force is the force component perpendicular to the surface on which the body stands.
so no 'area of contact' is seen in that equation.
it must mean it is free from area of contact.
however in actuality that is not the case.
cycle with flat tires is harder to ride apart from the danger it poses to the rim.
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