A stone of mass m , tied to a string is being whirled in a vertical circle with a uniform speed. The tension in the string is

Question

A stone of mass m , tied to a string is being whirled in a vertical circle with a uniform speed. The tension in the string is, the same throughout the motion., minimum when the rope is in the horizontal position., minimum at the highest position of the circular path., minimum at the lowest position of the circular path.

MARKS App · Accepted Answer

As the speed is constant, centripetal force required towards the centre of the circle will be same. At the top, direction of gravitational force and tension acting on the object will be same. Therefore, we can write, m g + T = m v 2 r ⇒ T = m v 2 r - m g . Clearly in this case, tension in the string will be minimum.

Search any question & find its solution

Looking for more such questions to practice?