A ride at an amusement park consists of a rotating cylinder with a radius of 5.00 m. After it   reaches a certain speed, the floor drops away, and riders are held to the walls via the force of   static friction. The coefficient of static friction between a rider and the wall is 0.400. What is   the minimum speed needed to ensure that the rider will not slide down the wall?

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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.