Answer / prasad

FRICTION IS THE OPPOSIVE FORCE FROM THE CONTACT AREA, NORMAL
REACTION IS THE OPPOSIVE FORCE TO THE CONTACT SURFACE, IF THE
CONTACT AREA INCREASES THEN FRICTION ALSO INCRASES.. EG: THE
WIDE TYRES MAKE MORE FRICTION AND LESS MILAGE THAN NARROW
TYRES.........

Answer / neeraj

the rolling of bike is easy when tyre is completely fill by
air whereas it is difficult to roll when it empty becoz of
contacting area is increased in second case for the
constant load of the bike.

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