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`        Sir please describe me physical meaning of angular momentum`
7 years ago

SAGAR SINGH - IIT DELHI
879 Points
```										Dear student,
Consider a particle capable of rotation about an axis. At any time t, let its momentum be and , the position vector. Then the angular momentum is given by the cross product  and .  =  x .
In three dimensions,

Lx = ypz - zpy, Ly = zpx - xpz, Lz = xpy - ypx.
The angular momentum, which is nothing but moment of linear momentum, can be expressed in terms of the lever arm for momentum.
Let us consider the case of angular momentum in two dimensions.
L = xpy - ypx
If  j is the angle between  and x-axis, then px = p cos y and py = p sin y. Also x = r cos q, y = r sin q.
Hence, we can define angular momentum as the product of linear momentum and the lever arm for momentum.

All the best.
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Sagar Singh
B.Tech, IIT Delhi

```
7 years ago
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