Calculating Torques on a Door with Hinges

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    Hinges Torques
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SUMMARY

The discussion focuses on calculating the torques acting on a door supported by two hinges located at heights L/4 and 3L/4 from the floor. Participants analyze the torque contributions from three forces: the vertical force at the center of mass (point C) and the forces at the hinges (points A and B). The general formula for torque is emphasized, with discussions on using components and the significance of the angles involved. Key equations include the balance of torques around points A and B, ensuring that the sum of torques equals zero for static equilibrium.

PREREQUISITES
  • Understanding of torque calculations in physics
  • Familiarity with vector decomposition and force components
  • Knowledge of static equilibrium conditions
  • Ability to apply trigonometric functions in physics problems
NEXT STEPS
  • Study the principles of static equilibrium in two-dimensional systems
  • Learn about torque calculations using the cross product in vector mechanics
  • Explore the decomposition of forces into horizontal and vertical components
  • Practice solving problems involving multiple forces and torques
USEFUL FOR

This discussion is beneficial for physics students, engineering students, and anyone involved in mechanics, particularly those studying statics and dynamics related to structures and forces.

  • #31
haruspex said:
Ok, but without a given mass or weight for the door there is no hope of finding any torques or forces. Are you quite sure there is nothing given? Any diagram?

So the professor said he forgot to say that we can express our Fg with the mass of door m, therefore Fg isn't unknown anymore and I can express everything with the terms m,g,d and l now, thanks for your time :)
 

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