Sat March 12, 2011 By: Rohan Mehra

During the circular motion why is the tension zero at the topmost point?

Expert Reply
Sat March 12, 2011
Dear student,
At the topmost point 2  forces are acting on the body. the weight force is acting vertically downwards and the centrifugal force due to its circular force is acting vertically upwards(centrifugal force always acts perpendicular to the velocity of the body.)  when the two forces balance each other the tension acting on the body becomes zero.  mw^2r = mg( where m= mass of the sphere. w = angular velocity of the sphere . g= accelaration due to gravity. )
Hope this helps.
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