Which Conservation Law Do I Use for a Hanging Rod Hit by a Particle?

AI Thread Summary
In rigid body dynamics, momentum conservation is applicable when there are no impulsive forces acting on the system, while angular momentum conservation is valid as long as there is no torque about the pivot point. For a rod hanging from a pivot that is struck by a particle inelastically, the appropriate conservation law to use would depend on the nature of the forces involved. If the impact creates an impulsive force, momentum conservation should be applied. Conversely, if the system experiences no torque, angular momentum conservation can be utilized. Understanding the conditions for each conservation law is crucial for solving such problems effectively.
zhenyazh
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hi
in rigid body questions are there cases where i should use moment conservation
and not angular moment conservation or the opposite?

when would i use which?
 
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Good question. Use momentum conservation only when there is no impulsive force on your assumed system, or a non-impulsive force for conservation over a long period of time.Angular momentum conservation holds as long as there is no torque about the point.

Here's then a question for you. A rod hanging from a pivot is hit with a particle(inelastically).What would you use?
 
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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