A bob of mass m attached to an inextensible string of length l is suspended from a vertical support. The bob rotates in a horizontal circle with a angular speed ω rad/s about the vertical. About the point of suspension :
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Angular momentum of the pendulum about the suspension point 'O' is
Then can be resolved into two components, radial component r rad , and axial component r axial . Due to r rad , L will be axial and due to r axial , L will be radially outwards as shown.
So net angular momentum will be as shown in figure whoose value will be constant (|L| = mv λ ). But its direction will change as shown in the figure.
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