White down the principal of
consenvation of angulat momentum
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Principle of conservation of angular momentum states that, If no external torque acts on a system, the total angular momentum of the system remains constant. If I be the moment of inertia of a body about a given axis of rotation and w be its angular velocity, then I w = constant.
An example of conservation of angular momentum is seen in an ice skater executing a spin, as shown in. The net torque on her is very close to zero, because
1) there is relatively little friction between her skates and the ice, and
2) the friction is exerted very close to the pivot point.
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