A 9 kg block is on a frictionless table and is moving at 21 m/s around in a circle that has a radius of 9 m. The block is attached to a string that passes through a hole at the circle center. A ball is attached to the other end of the string and is hanging in the air. Assuming the ball is stationary, determine the ball's mass. Side view Top view mball =

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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.