Static Equilibrium of weighted door

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Homework Help Overview

The problem involves analyzing the static equilibrium of a weighted door supported by two hinges. The door's dimensions and weight are provided, and the task is to determine the horizontal components of the forces exerted by the hinges.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • Participants discuss the vertical forces exerted by the hinges and question whether horizontal components are also present. There is an exploration of torque calculations around the hinges and the forces contributing to those torques.

Discussion Status

The discussion is ongoing, with participants raising questions about the nature of forces and torques involved. Some guidance has been offered regarding the need to sum torques and forces, but no consensus has been reached on the specifics of the forces at play.

Contextual Notes

Participants are considering the implications of Newton's laws of equilibrium and the distribution of forces in the context of the door's weight and hinge placements.

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Homework Statement


A door of width 1.08 m and height 1.92 m weighs 281 N and is supported by two hinges, one 0.600 m from the top and the other 0.600 m from the bottom. Each hinge supports half the total weight of the door. Assuming that the door's center of gravity is at its center, find the horizontal components of force exerted on the door by each hinge.


Homework Equations





The Attempt at a Solution



I don't really understand the question; shouldn't the force from the hinges be vertical/upwards? To counter the downward force the door's weight?
 
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As stated, each hinge shares the vertical weight equally, with upward forces exeted by each hinge on the door. But that is just part of the force exerted by each hinge on the door. You must sum torques about one of the hinges, and sum forces in the horizontal direction, to find the horizontal components of the force exerted by each hinge on the door, per Newton's 1st law of equilibrium.
 
PhanthomJay said:
As stated, each hinge shares the vertical weight equally, with upward forces exeted by each hinge on the door. But that is just part of the force exerted by each hinge on the door. You must sum torques about one of the hinges, and sum forces in the horizontal direction, to find the horizontal components of the force exerted by each hinge on the door, per Newton's 1st law of equilibrium.
Besides the weight of the door, what other torque is there?
 
If you choose the lower hinge as the point aboit which you wish to calculate torques, The weight of the door produces a torque, yes, but also, would not the force of the top hinge on the door also produce a torque about that point? Would the force of the bottom hinge on the door produce a torque about that point?
 

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