How to make physics problem obey momentum conservation?

AI Thread Summary
In physics problems involving momentum conservation, it is possible to redefine the system to eliminate external forces, similar to work/energy problems. For instance, including the Earth, a mass, and a spring as part of the system can help achieve this. The key equation to remember is P=mv, which relates momentum to mass and velocity. Even when addressing conceptual questions, demonstrating personal effort is essential, despite the simplicity of the inquiry. Understanding how to manipulate the system is crucial for solving momentum-related problems effectively.
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Homework Statement


Can you change the system (as you would in a work/energy problem) so you can get rid of all external forces in a momentum problem for example by making your system the earth, a mass, and a spring (if the problem involved those 3 objects)?

Homework Equations



P=mv[/B]

The Attempt at a Solution



conceptual question
 
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Even with a conceptual question you still need to show your own effort.
 
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But it's just a yes or no question.
 
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...
View full post »

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