What is the Torque on an Outstretched Arm with a 21.5 N Weight?

  • Thread starter Thread starter BuBbLeS01
  • Start date Start date
  • Tags Tags
    Arm Torque
Click For Summary
SUMMARY

The discussion focuses on calculating the torque produced by a 21.5 N weight held in an outstretched arm. The arm's dimensions include a shoulder-to-elbow length of 33.5 cm and an elbow-to-wrist length of 23.0 cm, with the weight's center located 6.5 cm from the wrist. The torque equation used is T = rF, where the torques about the elbow are analyzed using the equation T1D1 + T2(D1+D2) - T3(D1 + D2 + D3) = 0. The user expresses confusion regarding the placement of the center of torque and the calculations involving the elbow and wrist.

PREREQUISITES
  • Understanding of basic physics concepts, specifically torque and lever arms.
  • Familiarity with the torque equation T = rF.
  • Knowledge of the anatomy of the human arm and its measurements.
  • Ability to solve linear equations involving multiple variables.
NEXT STEPS
  • Review the principles of torque and equilibrium in physics.
  • Study the effects of different pivot points on torque calculations.
  • Learn about the application of torque in biomechanics.
  • Practice solving similar problems involving forces and distances in physics.
USEFUL FOR

Students studying physics, particularly those focusing on mechanics, as well as individuals interested in biomechanics and the physical principles of human movement.

BuBbLeS01
Messages
602
Reaction score
0

Homework Statement


A 21.5 N weight is held in the outstretched hand of a person with a shoulder-to-elbow length of 33.5 cm and an elbow-to-wrist length of 23.0 cm. The center of the weight is 6.5 cm from the person's wrist. Determine the magnitude of the torque about the elbow produced by the weight.


Homework Equations


T=rF


The Attempt at a Solution


T1 - Elbow
T2 - Wrist
T3 - Hand w/weight
T1D1 + T2(D1+D2) - T3(D1 + D2 + D3) = 0
T1 = -T2(.565m) + T3(.63)/.335

I know I am doing something wrong with the torques but I can't figure out what? I thought I just put in 21.5 N.
 
Physics news on Phys.org
I forgot to mention that I put my center of torque at the shoulder
 
Can I not have the center of torque there?
 

Similar threads

Calculating torque of rotator cuff muscle
  • · Replies 7 ·
Replies
7
Views
3K
Finding Equilibrium in a Weightlifting System: Torque and Statics Explained
  • · Replies 17 ·
Replies
17
Views
3K
Determine the magnitude of the torque
  • · Replies 4 ·
Replies
4
Views
6K
Biomechanics Biceps Problem - Classical Mechanics (Moment Arms/Forces)
  • · Replies 8 ·
Replies
8
Views
6K
How Much Force Must the Biceps Generate in an Isometric Exercise?
  • · Replies 1 ·
Replies
1
Views
2K
Solve Hydraulic Pump Homework: F1=33.5 N
  • · Replies 1 ·
Replies
1
Views
2K
What happens to the force acting on the elbow with a straight bicep?
  • · Replies 10 ·
Replies
10
Views
9K
What Is the Required Muscle Force to Hold an Outstretched Arm?
  • · Replies 2 ·
Replies
2
Views
10K
How Do You Calculate Bicep Tension and Elbow Joint Forces in Physics Problems?
  • · Replies 4 ·
Replies
4
Views
10K
What is the net torque about the axle?
  • · Replies 6 ·
Replies
6
Views
22K