Free fall and slide, gained speed?

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Homework Help Overview

The discussion revolves around a physics problem comparing the speed of two objects reaching the ground, one in free fall and the other sliding down an inclined plane. The subject area includes concepts of energy conservation and motion on inclined surfaces.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants explore the conservation of energy principle, equating potential energy and kinetic energy to derive speeds for both scenarios. Questions arise regarding the effects of friction, particularly when considering an inclined plane made of ice.

Discussion Status

The discussion is active, with participants examining the implications of friction on the speed of the sliding object. Some guidance is offered regarding the assumptions of frictionless conditions, but there is no explicit consensus on the effects of friction in this context.

Contextual Notes

Participants are considering scenarios where friction may be negligible, specifically in the case of ice surfaces, and questioning the validity of these assumptions in their analysis.

jaguar___
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Homework Statement


which one would be faster when reached the ground?

Homework Equations

The Attempt at a Solution


conservation of energy
Pe=Ke
mgh=1/2mV^2
for 2-)m*g*cosa*(h/cosa)=1/2*m*V^2 -- V= sqrt(2*g*h)
for 1-) V=sqrt(2*g*h)
so V1=V2
 

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jaguar___ said:

Homework Statement


which one would be faster when reached the ground?

Homework Equations

The Attempt at a Solution


conservation of energy
Pe=Ke
mgh=1/2mV^2
for 2-)m*g*cosa*(h/cosa)=1/2*m*V^2 -- V= sqrt(2*g*h)
for 1-) V=sqrt(2*g*h)
so V1=V2
I think that would be true in the absence of friction.
 
can we say if the inclined plane is ice and also the weights are ice there wouldn't be friction? or so small that can be ignored?
 
jaguar___ said:
can we say if the inclined plane is ice and also the weights are ice there wouldn't be friction? or so small that can be ignored?
You can say anything you want. Does it make sense in the context of the situation?
 

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