Question

while driving along an unbanked circular road a two wheeler rider has to lean with the vertical. why is it so? with what the rider lean ?driver the relevant expression why such a leaning is not necessary for a four wheeler .
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Answer 1

Answer:

A rider must lean into a turn to prevent tipping over in the other direction. To remain upright while turning to the left, there are three forces acting on the rider and bicycle. The frictional force provides the centripetal force necessary to turn the cyclist to the left.

Explanation: