A skateboarder is attempting to make a circular arc of radius r = 19 m in a parking lot. The total mass of the skateboard and skateboarder is m = 87 kg. The coefficient of static friction between the surface of the parking lot and the wheels of the skateboard is us= 0.68 . 1)What is the maximum speed,  he can travel through the arc without slipping?  2)He speeds up very slightly and begins to slide. The coefficient of kinetic friction is uk = 0.13. What is the new magnitude,  of his radial acceleration?

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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.