Is angular momentum of a system always conserved ?

Explanation

To determine whether the angular momentum of a system is always conserved, we can follow these steps:

### Step 1: Understand Angular Momentum
Angular momentum (L) of a system is defined as the product of the moment of inertia (I) and the angular velocity (ω) of the system. Mathematically, it can be expressed as:
\[ L = I \cdot \omega \]

### Step 2: Introduce Torque
Torque (τ) is defined as the rate of change of angular momentum with respect to time. This relationship can be expressed as:
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