A car travels on a circular road with radius R and banking angle 0 chosen so that at the speed v the friction force vanishes (the optimal banking). What is the friction force acting on the car of mass m on this road at rest? Investigate the cases of small and large v.

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Centripetal Force

A particle, body, object or certain mass while travelling in a rotational path or semicircular path, experiences an inertia force. If that inertia force pulls the towards the inward of the imaginary circle in the rotation, it is termed as centripetal force.