Torque of human arm when bending

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Homework Help Overview

The discussion revolves around calculating the torque required to bend the human arm at various angles (180 degrees, 90 degrees, and 30 degrees) at the elbow joint, with the arm not holding any weight. The subject area includes biomechanics and physics principles related to torque.

Discussion Character

  • Exploratory, Assumption checking

Approaches and Questions Raised

  • The original poster attempts to apply the torque equation τ=rFsinθ, providing details about the arm's weight and dimensions. Some participants question the need for additional information, such as the orientation of the upper arm during the bending motion.

Discussion Status

The discussion is ongoing, with participants encouraging the original poster to clarify their attempts and share more details. There is a request for clearer presentation of the work done so far, indicating a collaborative effort to understand the problem better.

Contextual Notes

Participants note that the original poster has provided some relevant equations and information but may have uncertainties about their correctness. There is an emphasis on understanding the setup and assumptions involved in the torque calculations.

mdp_somebodeh
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To find the respective torque that is need to bend the the arm at 180 degrees, 90 degrees and 30 degrees. The arm is not holding anything.

Relevant equations and information
τ=rFsinθ

total arm weight =3.35kg
upper arm length =19cm
forearm length =28cm
 
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welcome to pf!

hi mdp_somebodeh! welcome to pf! :wink:

show us what you've tried, and where you're stuck, and then we'll know how to help! :smile:

(start with 180°)
 
This is bending at the elbow, right? Don't you need to know the orientation of the upper arm?
 
sorry, too difficult to read :redface:

can you type it out, please? :smile:
 

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