Dog walking on a raft on water then suddenly halting

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Homework Help Overview

The problem involves a dog standing on a raft that is floating on water, with the dog walking towards the shore and then halting. The scenario raises questions about the movement of the raft and the forces involved, specifically considering the mass of the dog and the raft.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants discuss the nature of forces acting on the raft and question the concept of external forces in this context. There is uncertainty about how the dog's actions affect the raft's movement when the dog stops.

Discussion Status

The discussion is ongoing, with participants exploring the implications of the dog's movement and questioning the assumptions about external forces. There is no clear consensus yet, but the dialogue suggests a productive examination of the problem's dynamics.

Contextual Notes

Participants express concern about potentially overthinking the problem, indicating a need to clarify the definitions of external forces and the interactions between the dog and the raft.

totallyclone
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Homework Statement


A dog of mass 10.0kg is standing on a raft so that he is 20.0m from shore. He walks 8.00m along the raft towards shore and then halts. The raft has a mass of 40.0kg, and we can assume there is no friction between the raft and the water. How far is the dog from shore when he stops?


Homework Equations


EK=1/2 mv2


The Attempt at a Solution


This is a really tricky question and I'm not quite sure how to proceed. I know that when the dog halts, the raft moves forward towards the shore?
 
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What's tricky about it? What external force would cause the raft to have a net movement?
 
phinds said:
What's tricky about it? What external force would cause the raft to have a net movement?

I find this question tricky because maybe I'm overthinking it...

I think the external force would be what the dog applies. Then suddenly stopping, transfers the energy to the raft causing it to more forward towards the shore?
 
totallyclone said:
I find this question tricky because maybe I'm overthinking it...

I think the external force would be what the dog applies. Then suddenly stopping, transfers the energy to the raft causing it to more forward towards the shore?

How is the dog external? What is the dog acting on that is external to the raft?
 

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