Conservation of Kinetic Energy During Collision

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Homework Help Overview

The discussion revolves around the conservation of kinetic energy during collisions, specifically focusing on the calculations involved in determining changes in kinetic energy. Participants are exploring the principles of kinetic energy and its application in collision scenarios.

Discussion Character

  • Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants are attempting to apply the kinetic energy formula K=1/2MV^2 to analyze a collision problem. Questions arise regarding the correct method for calculating changes in kinetic energy, specifically whether to subtract initial from final or vice versa.

Discussion Status

The discussion is active, with participants engaging in clarifying the process of calculating changes in kinetic energy. Some guidance has been offered regarding the interpretation of positive and negative changes in energy, though there is still exploration of the underlying concepts.

Contextual Notes

There appears to be some confusion regarding the definitions and calculations of kinetic energy changes, as well as the assumptions about energy loss or gain during collisions.

mohabitar
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For number 3, I don't really know how to approach it. Nothing in my notes that covers such a thing. I tried using K=1/2MV^2, but that's not it. Any ideas?
 
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mohabitar said:
I tried using K=1/2MV^2, but that's not it. Any ideas?
What do you mean "that's not it"? Did you calculate the initial and final kinetic energy?
 
Ohh, duh! So subtract the final kinetic from initial kinetic. Well actually it turned out that we subtract initial from final, why do we do that rather than final from initial? (how do we know whether it lost or gained energy)
 
Change always means final minus initial. If the change is positive, then you've gained energy. (Is that likely?)
 

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