"Understand Motion of Block on Turntable

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Homework Help Overview

The problem involves a block of mass M placed at a distance R from the center of a rotating turntable, with discussions focusing on its motion under two scenarios: a frictionless surface and a surface with static friction. Participants are exploring the dynamics of the block as it interacts with the turntable's rotation.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants are attempting to understand the nature of the block's motion on a turntable, questioning whether it moves in a circular path or in another direction. They are also discussing the forces acting on the block and the implications of friction on its motion.

Discussion Status

The discussion is ongoing, with participants sharing their interpretations and seeking clarification on the problem's requirements. Some have provided insights into the motion of the block, while others are still grappling with the concepts involved, particularly in relation to the equations needed for part B.

Contextual Notes

There is uncertainty regarding the specific expectations for explaining the motion of the block and the relevant equations for the second part of the problem. Participants are also noting the potential for misunderstanding the question's intent.

student 1
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Turntable ??

Homework Statement


A block of mass M is place a Distance R from the center of a turntable rotating at W radians/sec.
A. If the turntable is a frictionless surface, explain the motion of the block.
B. If the turntable has coefficient of static Friction Us and the block is ready to begin slipping when the turntable is rotating with W radians/sec, find an expression for Us in terms W, R, and g.


Homework Equations





The Attempt at a Solution


What is it talking about explain the motion of block? and I don't even know where to begin with the second part because I don't understand the first. I know the block will begin to slide and eventually fall off the turntable. But I'm not sure what its asking for.
 
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For part A, when it asks you to explain the motion of the block, id think that it wants you to describe how the block moves (does it go around with the table? Does it move off in some other direction?) and explain why this motion happens.
 


It would move closer and closer to the edge of the turntable with each rotation. I understand that, however, I know that's not going to be the right answer unfortunately.
 


student 1 said:
It would move closer and closer to the edge of the turntable with each rotation. I understand that, however, I know that's not going to be the right answer unfortunately.
For part (A), what force makes the block move?

You haven't done anything yet for part B. In particular, what are the relevant equations? We put those things in the template so you would use them.
 

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