A curve of radius 1.80x10^2m is being designed in a new highway to allow cars travelling at 70.0 km/h to round the curve with zero frictional forces.  a.)at what angle must the road be banked? b.)what is the minimum coefficient of friction that will allow a car to successfully go around the curve at 30.0 km/h?

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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.