A children's playground merry-go-round consists of a circular platform of radius 2.0 m, which rotates about a central axis. A father, pushing on the outer edge, accelerates the merry-go-round from rest to a final tangential speed of 3.0 m/s in one full revolution. There is a child on the merry-go-round standing half way between the centre and the edge.

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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.