Show the relationship between torque and angular momentum

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Homework Help Overview

The discussion revolves around designing a physics lab to demonstrate the relationship between torque and angular momentum, specifically using a 4" PVC coupling on a ramp. The original poster is exploring how to effectively measure and relate these concepts in a practical experiment.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • The original poster outlines their approach to measuring moment of inertia and angular momentum, while expressing uncertainty about calculating angular acceleration and torque. They question how to determine the force applied to the PVC coupling and its relationship to the incline.

Discussion Status

Participants are engaged in clarifying the steps necessary to relate torque and angular momentum, with some guidance provided on measuring moment of inertia and velocity. However, there remains a lack of consensus on how to calculate angular acceleration and the force applied, indicating ongoing exploration of these concepts.

Contextual Notes

The discussion includes a focus on practical experimentation and the need for specific measurements, with an emphasis on understanding the underlying physics principles without providing direct solutions.

Shank
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<Moderator's note: Moved from a technical forum and thus no template.>

I am trying to design and perform a physics lab. It needs to show the relationship between torque and angular momentum. I have gotten as far designing a 4" PVC coupling and have it on a ramp. I am not sure where to go from here.
 
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Shank said:
I am trying to design and perform a physics lab. It needs to show the relationship between torque and angular momentum. I have gotten as far designing a 4" PVC coupling and have it on a ramp. I am not sure where to go from here.
Is this a homework project? And could you give more details?
 
Yes it is. I have reworded it below:

I am trying to design and perform a physics lab. It needs to show the relationship between torque and angular momentum. I have gotten as far designing this: I have a 4" PVC coupling that rolls down a ramp.

I can figure out the moment of inertia with the mass and radius of the item. I can figure out how to get velocity by timing how long it takes to roll down the ramp. Then, the average angular velocity is the velocity divided by the radius. This multiplied by the moment of inertia gives me the angular momentum.

Now I need to relate that to torque. This means I need the angular acceleration to be multiplied by the moment of inertia. I am not sure how to get this. Also, I need to measure torque in a different way to compare the results. So I need the force applied to the pipe multiplied by the radius. The problem there is I am not sure how to calculate the force applied. Is is gravity divided by the angle of the incline?
 
Shank said:
done
You're done adding more details, or you are done with your lab?
 

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