Solve Torque Problem Homework: Finding Moment of Force on L-Shaped Bracket

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SUMMARY

The discussion focuses on calculating the moment of force acting on an L-shaped bracket, specifically addressing the error in the initial calculation. The correct approach involves recognizing that the moment is determined by the cross product of the moment arm and the force vector, which requires accounting for the angle between them. The initial calculation incorrectly assumed the force acted perpendicular to the moment arm, leading to an inaccurate result. The correct formula for moment calculation must incorporate this angle to yield the accurate moment vector.

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  • Knowledge of trigonometry, specifically relating to angles in triangles
  • Basic principles of mechanics, including force and torque
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Homework Statement



Find the moment (vector) of the force acting on the “L-shaped”
bracket about the axis indicated.

2nusqxi.png


Homework Equations



m=rf

The Attempt at a Solution



Hypotenuse of triangle = sqrt(13)

Moment = sqrt(13)* 5 nm


This is a wrong according to my textbook however I do not understand why.
 
Physics news on Phys.org
The 5.0 N force is not acting perpendicular to the moment arm. Review the definition of how to calculate a moment.
 
The moment is a cross product, you haven't taken into account the angle between the moment arm and the force.
 

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