Help with something to do with angular stuff?

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Homework Help Overview

The discussion revolves around a problem involving angular motion and friction, specifically related to a copper block on a rotating steel turntable. The scenario includes parameters such as distance from the center, coefficient of static friction, and angular acceleration.

Discussion Character

  • Exploratory, Conceptual clarification, Mathematical reasoning

Approaches and Questions Raised

  • Participants express uncertainty about the relevant formulas and concepts, particularly regarding centrifugal and centripetal forces. There are attempts to clarify the distinction between these forces and to explore the necessary calculations for maintaining circular motion.

Discussion Status

The discussion includes various attempts to understand the problem, with some participants suggesting the use of force diagrams and formulas related to circular motion. There is a mix of confusion and exploration of concepts without a clear consensus on the approach to take.

Contextual Notes

Participants are grappling with the definitions and calculations related to forces in rotational motion, indicating a need for clarification on the concepts of static friction and angular displacement. The original poster expresses a lack of knowledge about the formulas needed for the problem.

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A copper block rests 39.0 cm from the center of a steel turntable. The coefficient of static friction between the block and the surface is 0.34. The turntable starts from rest and rotates with a constant angular acceleration of 0.50 rad/s2. After what time interval will the block start to slip on the turntable? (Hint: The normal force in this case equals the weight of the block.)


I seriously have no idea which formulas to use...Thanks!

Solved...thanks
 
Last edited:
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Do you know how to calculate the centrifugal force on a rotating object?
 
HallsofIvy said:
Do you know how to calculate the centrifugal force on a rotating object?

I only know how to do centripetal forces...

Actually hold on...maybe
 
I have down the formula:

force that maintains circular motion=mrw^2

If there was a way to find angular displacement, that would be helpful.
 
HallsofIvy said:
Do you know how to calculate the centrifugal force on a rotating object?

If you're trying to confuse the poor lad, that's not very nice. Centrifugal force, as I'm sure you know, is a fictional force, which means, for the purposes of this thread, that it doesn't exist.
 
Try doing a force body diagram.
 
Ok...I'm trying to calculate what Fs is now...thanks!
 

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