Maximum Static Friction Force for Spinning Disk and Block System

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    Circle Dynamics
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Homework Help Overview

The discussion centers around a problem involving a penny resting on a block that is supported by a spinning disk. The focus is on determining the maximum rate of rotation of the disk without the penny or block sliding, considering the coefficients of static and kinetic friction between the objects.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • Participants explore the forces involved, particularly the role of static friction in preventing sliding. Questions are raised about the maximum force that static friction can exert on each object.

Discussion Status

The discussion is active, with participants engaging in questioning the forces at play and considering the implications of static friction. Some participants express confidence in their ability to solve the problem, while others seek clarification on specific aspects of the forces involved.

Contextual Notes

Participants are navigating the problem with specific coefficients of friction provided, which may influence their reasoning about the forces and maximum rotation rate. There is an emphasis on understanding the limits of static friction in this context.

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Homework Statement


A penny of mass 3.10g rests on a small 20.0g block supported by a spinning disk. The coefficients of friciton between block and disk are .750(static) and 0.640(kinetic) while those for the penny and block are 0.520(static) and .450(kinetic). What is the maximum rate of rotation in revolutions per minute that the dsk can have, without the block or penny sliding on the disk?


Homework Equations





The Attempt at a Solution

 
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What force prevents the penny from sliding?
 
static friction
 
I think I can solve this problem now thanks
 
Right. So what's the maximum force that static friction can exert on each object?
 

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