Conservation of Angular Momentum | Application | Demo | Uzair | DIY | Activity Physics class 11 Urdu

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Angular momentum is a measure of an object's rotational motion. It depends on two factors:
1) Moment of Inertia (I): This is a measure of how difficult it is to change an object's rotational motion. It depends on the object's mass distribution and shape.
2) Angular Velocity (ω): This is the rate at which an object is rotating.
The Law of Conservation of Angular Momentum:
"This law states that the total angular momentum of a system remains constant as long as no external torque acts on it."
In simpler terms, if an object is spinning, it will continue to spin at the same rate unless something outside the system interferes.
Example: The Revolving Stool Experiment
In your YouTube video, you're likely demonstrating this law using a revolving stool. Here's how it works:
Initial State: The student sits on the stool with their arms outstretched, holding weights. The stool is spinning at a certain rate.
Changing Moment of Inertia: When the student pulls their arms in towards their body, they decrease their moment of inertia.
Increased Angular Velocity: Since angular momentum must remain constant, the stool's angular velocity increases to compensate for the decrease in moment of inertia. As a result, the student spins faster.
Reversing the Process: When the student extends their arms again, their moment of inertia increases, and their angular velocity decreases, returning to the original spinning rate.
Key Points:
1) The law of conservation of angular momentum is a fundamental principle of physics.
2) It applies to both rotating objects and systems of objects.
Changes in an object's moment of inertia can affect its angular velocity.
The law can be observed in everyday life, from spinning tops to figure skaters.