A body revolves in a vertical circle such that its motion at different points is different then the motion of the body is said to be vertical circular motion.
Consider an object of mass m tied at one end of an inextensible string and whirled in a vertical circle of radius r.
Due to influence of earth’s gravitational field, velocity and tension of the body vary in magnitude from maximum at bottom (lowest) point to minimum at the top (highest) point. Hence motion of body in vertical circle is non uniform circular motion.
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