A 30-kg child is sitting 5.0 m from the center of a 500-kg merry-go-round that is rotating counter-clockwise at 1.70 rad/s.  A braking mechanism provides an acceleration of magnitude 0.05 rad/s2.   Determine the number of rotations to bring the merry-go-round to rest. What is the initial tangential velocity of the child?

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.