Direction of friction in a yoyo rolling on an inclined plane

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Homework Help Overview

The discussion revolves around the direction of friction acting on a yoyo rolling down an inclined plane, exploring the mechanics of rolling motion and the forces involved.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are questioning the direction of friction and its role in preventing slipping. They discuss the implications of friction's direction on the rotation of the yoyo and the forces acting on it. Some participants also consider the effects of changing the configuration of the string.

Discussion Status

The discussion is active, with participants raising questions about the mechanics involved and exploring different scenarios. There is an emphasis on understanding the relationship between forces and motion without reaching a definitive conclusion.

Contextual Notes

Participants are considering the effects of friction in the context of rolling motion and the specific setup of the yoyo and incline. There is a reference to external resources for further exploration of rolling motion concepts.

dahoom102
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Homework Statement
In this problem why is the friction directed downwards not upwards? Shouldn't the velocity of the point of contact with the ground be zero and therefore mgsin = fs ? All of the problems i studied the friction was in the upward direction i just wanna know why is it different here.
Relevant Equations
F.B.D
Mgsin
fs
Screenshot_20210304-190909_Drive.jpg
 
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dahoom102 said:
In this problem why is the friction directed downwards not upwards?
If there was no friction, which way would the yoyo rotate? And, therefore, which way would the contact point of the yoyo tend to slip on the surface of the incline? Which way must friction act to prevent such slipping?
 
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dahoom102 said:
In this problem why is the friction directed downwards not upwards?
Take moments about the centre of the yoyo. What does that tell you about F and fs?
What if the string were wound the other way around, so that F is applied above the centre?
 
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