The drawing shows a lower leg being exercised. It has a 49 N weight a

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SUMMARY

The discussion focuses on calculating the torque generated by a 49 N weight attached to a lower leg, extended at an angle θ with respect to the vertical, with the rotational axis at the knee. When θ equals 90 degrees, the torque is maximized, as the force acts perpendicular to the lever arm. The participant seeks clarification on the correct labeling of angles and the relationship between the angle of force and the lever arm. Ultimately, the participant resolves their confusion regarding the torque calculation and labeling.

PREREQUISITES
  • Understanding of torque and its calculation
  • Knowledge of rotational dynamics
  • Familiarity with vector components of forces
  • Basic trigonometry, specifically angle relationships
NEXT STEPS
  • Study the principles of torque in physics, focusing on the formula τ = r × F
  • Learn about the role of angles in torque calculations, particularly in rotational systems
  • Explore the concept of lever arms and their impact on torque magnitude
  • Review diagrams of forces acting on rigid bodies to improve labeling skills
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Students studying physics, particularly those focusing on mechanics and rotational motion, as well as educators seeking to clarify torque concepts for learners.

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Homework Statement



The drawing shows a lower leg being exercised. It has a 49 N weight
attached to the foot and is extended at an angle θ with respect to the
vertical. Consider a rotational axis at the knee.
a. When o
θ = 90.0 , find the magnitude of the torque that the
weight creates

Homework Equations





The Attempt at a Solution



Shouldn't the angle be the force (weight) with respect to r? Here is r with respect to r perpendicular, or did I get the labels wrong? If it is the case, should we solve the angle by 90 - theta?

I get the answer but I don't get the concept. Can someone help me with the labelling?
Great appreciated if you can explain it on the diagram, thanks!
 

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i 've figured out! don't think i can delete the post..
 

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