Dividing Torque: Tangent and Centripetal Force Breakdown

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Discussion Overview

The discussion revolves around the breakdown of torque in relation to tangent and centripetal forces in the context of rotational motion. Participants explore how torque affects angular velocity and centripetal acceleration, seeking clarity on the distribution of forces involved.

Discussion Character

  • Exploratory
  • Technical explanation
  • Conceptual clarification

Main Points Raised

  • One participant seeks to understand how to divide torque between the tangent direction and the radius direction after it is applied to rotate an object.
  • Another participant suggests that applied torque creates angular acceleration, asking for a specific example to clarify the original question.
  • A different participant questions whether the discussion pertains to torque or the direction of velocity in uniform circular motion.
  • A participant describes a scenario involving a turntable, proposing that torque leads to a constant angular velocity and results in centripetal force, but expresses confusion about how to quantify the forces involved.
  • Another participant asserts that all torque contributes to the change in angular velocity, stating that centripetal force acts perpendicularly to the direction of travel and does not involve work or energy consumption.

Areas of Agreement / Disagreement

Participants express differing views on the relationship between torque, angular velocity, and centripetal force. There is no consensus on how to quantify the distribution of forces or the role of torque in this context.

Contextual Notes

Participants have not fully defined their assumptions regarding the relationship between torque and the forces in question, and there are unresolved aspects related to the mathematical treatment of these concepts.

Drifter009
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I'm in the Rotational Motion Chapter.

After torque is applied to rotate an object,how do I go about breaking down the tangent vector and the centripetal force vector?

What I want to know is how the torque is being divided between the tangent direction and the radius direction.
 
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I'm not quite sure what you mean. An applied (net) torque creates an angular acceleration.

Perhaps you can give a specific example of what you are asking about.
 
You mean torque or the direction of velocity in uniform circular motion?

Maybe you can get some informaiton from this site:
http://ray.crk.umn.edu/physics/1012/lessons/lesson8.pdf
 
Last edited by a moderator:
Doc Al,

I'm assuming when a torque is applied to a record to make it spin on the turn table that this results in an angular change in velocity, which settles into a constant velocity of 33 and 1/2 rpms. As a result of the constant angular velocity, a centripetal force occurs. I'm trying to begin with a torque and split how much force goes into the change of angular velocity, an how much force goes into the centripetal acceleration. My books doesn't explain this.
 
Drifter009 said:
I'm trying to begin with a torque and split how much force goes into the change of angular velocity, an how much force goes into the centripetal acceleration.
All of the torque goes into the change of angular velocity. The centripetal force is the force preventing the object from going in a straight path, and it's perpendicular to the direction of travel, so no work (or energy consumption) occurs.
 

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