Question

State and prove principle of conservation of angular momentum. Explain it with examples.

Answer 1

When no external torque acts on the body , the net angular momentum of a rotting rigid body remains constant.

This is known as law of conservation of angular momentum.
Angular momentum L=I
Torque= dL/ dt
when on external torque acts on the system dL/dt
so, L=Iw

EXAMPLES
A ballet dancer can increase her angular velocity by folding her arms , as this decrease the moment if inertia

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Answer 2

Principle of conservation of angular momentum states that, If no external torque acts on a system, the totalangular momentum of the system remains constant.
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