Kinetic Energy and Collision Question

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Homework Help Overview

The discussion revolves around the concept of kinetic energy transfer during collisions, specifically questioning whether there is a maximum threshold for kinetic energy lost in such interactions.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • Participants explore the relationship between kinetic energy and momentum conservation during collisions, questioning how maximum kinetic energy loss can be defined. There are considerations of different collision scenarios, including glancing blows and coalescence.

Discussion Status

The discussion includes various interpretations of kinetic energy loss in collisions, with some participants providing insights into specific cases, such as when objects stick together or when irregular shapes are involved. There is no explicit consensus, but several productive lines of reasoning are being explored.

Contextual Notes

Participants are navigating the complexities of kinetic energy and momentum in different collision scenarios, including the implications of rotational energy and the nature of the objects involved.

bebop1
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Is there a threshold of maximum kinetic energy lost when kinetic energy is transferred between two objects through collision?

I just cannot find any information on this, any help would be VERY much appreciated.
 
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How much kinetic energy did the system start with?
That is the maximum that can be lost.
 
bebop1 said:
Is there a threshold of maximum kinetic energy lost when kinetic energy is transferred between two objects through collision?

I just cannot find any information on this, any help would be VERY much appreciated.
Momentum must be conserved. Their common mass centre therefore continues at the same velocity. Maximum KE loss occurs when they coalesce.
If it is a glancing blow, and the masses are not sticky, then their velocities parallel to the plane of contact will not change. Maximum KE loss when will be when their velocity components along the line of contact become the same.
If they are irregular shapes and the blow is glancing, it gets complicated since some of the energy may turn into rotational energy, so it depends whether you count that as conserved or lost.
 
There is also the case when a blob of wet clay collides with a fixed wall and sticks...
 
Simon Bridge said:
There is also the case when a blob of wet clay collides with a fixed wall and sticks...
Are you saying I did not cover that?
 

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