Conservation of Momentum and Energy

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Homework Help Overview

The discussion revolves around the conservation of momentum and energy in a system involving a block and clay, particularly focusing on the interactions during an impact and subsequent motion. The subject area includes concepts of linear and angular momentum as well as energy transformations.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants explore the conservation of momentum, questioning whether the equation MbV1=Vtot(M1+M2+M3) holds true. Some express uncertainty about the simplicity of the approach, while others affirm its validity. There is also a consideration of potential energy changes as the system moves, leading to questions about the relationship between energy and momentum.

Discussion Status

The discussion is active, with participants affirming the conservation of momentum while also raising questions about potential energy changes. There is a mix of agreement and uncertainty regarding the implications of these concepts, indicating a productive exploration of the topic.

Contextual Notes

Participants are navigating the relationship between momentum and energy, with some expressing concern about the completeness of their understanding. The discussion reflects an ongoing examination of assumptions related to the problem setup.

ryankunzzz
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Homework Statement


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Homework Equations


Conservation of liner and angular momentum
H1=H2
r x M1V1= r x M2V2

G1=G2
M1V1=M2V2

The Attempt at a Solution


I've gotten an equation for the velocity of the block and clay after the impact, and I also know that when the block reaches the highest point of its arc, its linear velocity is going to be the same as the velocity of the cart. Is the momentum going to be conserved and I can say MbV1=Vtot(M1+M2+M3)
 
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ryankunzzz said:
Is the momentum going to be conserved and I can say MbV1=Vtot(M1+M2+M3)
It seems like that would be true. On the other hand, I'm thinking, "It seems too easy. Am I missing something?" But I can't think of what that might be.
 
ryankunzzz said:
Is the momentum going to be conserved and I can say MbV1=Vtot(M1+M2+M3)
Yes, and I believe that is where the hint is directed.
 
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But what about the about the change in potential energy as the arm swings upward?
 
ryankunzzz said:
But what about the about the change in potential energy as the arm swings upward?
What about it? That's energy, not momentum.
 

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