Equillibrium: torque and net force

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SUMMARY

The discussion focuses on solving a physics problem involving equilibrium, specifically net torque and net force. The total force acting on the system is calculated as f1 = 885.92 N, which includes the weight of the ladder and the person. The relationship between horizontal forces is established as f2 = f3. The net torque equation is set up using the moment arm, with the critical distances being 3.8 meters for the height and 2 meters for the center of mass of the ladder, leading to a deeper understanding of torque calculations in static equilibrium scenarios.

PREREQUISITES
  • Understanding of static equilibrium principles
  • Familiarity with torque and moment arm concepts
  • Knowledge of force balance equations
  • Basic geometry related to right triangles
NEXT STEPS
  • Study the concept of moment arms in torque calculations
  • Learn how to apply the conditions for static equilibrium in complex systems
  • Explore the relationship between forces and distances in equilibrium problems
  • Practice solving similar problems involving ladders and angles in physics
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Students studying physics, particularly those focusing on mechanics and equilibrium, as well as educators seeking to enhance their teaching methods in torque and force analysis.

henry3369
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Homework Statement


http://imgur.com/rWsNsmp

Homework Equations


net torque = 0
net force = 0

The Attempt at a Solution


Finding f1 was easy.
f1 = wladder + person = 885.92 N
Then the horizontal forces are also equal:
f2 = f3

Now net torque = 0 (I'm using moment arm because there is no angle given):
f3(3.8) = wladder(moment arm) + wperson(0.70)

I can't manage to figure out the moment arm. I'm not sure if 0.7 meters can be used because I think that is the moment arm for the force of the person only. No angles were given, all I know is that the distance from the bottom of the ladder to the center of mass of the ladder is 2 meters.
 
Last edited by a moderator:
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henry3369 said:
No angles were given
Oh, yes, they were (but indirectly). Length of ladder = 4m, vertical height of ladder = 3.8m.
 
Svein said:
Oh, yes, they were (but indirectly). Length of ladder = 4m, vertical height of ladder = 3.8m.
Didn't think about it that way. Thanks!
 

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