Time required to reach to Speed of Roller table for a bar

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Homework Help Overview

The problem involves a rolling mill and a roller table, focusing on the time required for a bar to accelerate from 10 meters per second to 20 meters per second after being cut. The coefficient of friction is provided as a factor influencing this acceleration.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to understand the role of friction in the acceleration of the bar after cutting. Some participants question the formulation of the friction factor and its impact on the bar's speed.

Discussion Status

The discussion is ongoing, with participants seeking clarification on the friction factor and its implications for the problem. There is an invitation for the original poster to share their attempts and challenges to facilitate further assistance.

Contextual Notes

Participants are navigating the relationship between the coefficient of friction and the acceleration of the bar, with some uncertainty regarding the application of the given values in the context of the problem.

Kaustubh
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Homework Statement



If rolling mill is running at 10 meters per second and roller table after mill is running at 20 meters per second.
Before cutting of bar, it will move at 10 meters per second.

Before cutting, roller table is trying to pull the bar, but since bar is not cut, it will slip on roller.

After cutting, bar has to move with the speed of 20 meters per second on roller table.
How much time bar will take to reach to that speed?

Coiff of friction of roller is 0.5

Homework Equations



F = Mass x a.
Coiff of friction x g = a
 
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Welcome to PF!

Hi Kaustubh! Welcome to PF! :wink:

Show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:
 
Hi there,
I am unable to formulate the friction factor, which will affect speed of bar after cutting.
 
I don't understand …

the coefficient of friction is given as 0.5 :confused:
 

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