Calculating Energy Loss in a Hockey Puck Collision

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Homework Help Overview

The discussion revolves around calculating the energy loss in a collision between two hockey pucks on a frictionless ice rink. The original poster presents a scenario involving the mass and velocities of the pucks before and after the collision, seeking guidance on how to approach the problem.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants explore the conservation of momentum and energy, questioning whether the focus should be on the energy lost by the first puck or the system as a whole. There are discussions on how to calculate the energy before and after the collision using the kinetic energy formula.

Discussion Status

The discussion is active, with participants providing insights into the nature of the problem and clarifying the original poster's intent. Some guidance has been offered regarding the calculation of energy loss, but no consensus has been reached on the specific focus of the question.

Contextual Notes

Participants are considering the implications of a frictionless environment on energy loss and are discussing the assumptions related to the conservation of momentum and energy in the context of the collision.

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One hockey puck of mass 0.1 kg strikes an identical stationary puck on a frictionless ice rink. If the first puck had a velocity V(0)=3.8m/s before the collision and v(1)=0.8 m/s after in the same direction, what fraction of the energy was lost?
Where do I even start to find the answer??
 
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If the rink is frictionless, then no energy should be lost. This is a momentum problem, and momentum is a conserved quantity. Is this your question, or are you trying to find the fraction of energy lost in the first puck as opposed to the fraction of energy lost of the system?
 
I would assume the question is asking how much energy was lost by the first puck.

That's a simple matter of taking the energy before and after via E=1/2mv2

The difference would be the energy lost by the first puck.
 
If you are indeed talking about the energy lost by the first puck then dantose is correct.
 

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