Fri March 18, 2011 By: Rohan Mehra

A stone is whirled in the air. Does the angular momentum remain conserved.Why? Is tension an internal force in this case?

Expert Reply
Tue March 22, 2011
Dear student,
Yes, the angular momentum remains conserved,

The law states that “If the external torque acting on the body is zero, the angular momentum formula of the body remains constant”

For example,

Conservation of Angular momentum of planet about the sun:

Each planet revolves around the sun in elliptical orbit with sun at one focus of the ellipse. The gravitational force of sun acts on the planet. As gravitational force is central force, formula for the angle between force and position vector is 180⁰.

Yes, tension an internal force.

Hope this helps.



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