How Does a Heavy Ball Hanging by a Thread Demonstrate Gravity and Tension?

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Say the ball weighs 20 lbs and both strings are rated at 25 lbs max. Visualize what is going on with the upper string as you start apply downward force of say 5 lbs.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
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