A woman places her briefcase on the backseat of her car.  As she drives to work, the car negotiates an unbacked curve in the road that can be regarded as an arc of a circle of a radius 62.0 m. While on the curve, the speed of the car is 15 m/s at the instant the briefcase starts to slide across the back seat toward the side of the car.   (A) What force causes the centripetal acceleration of the briefcase when it is stationary relative to the car? Under what condition does the briefcase begin to move relative to the car?   (B) What is the coefficient of static friction between the briefcase and seat surface?

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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.