Static Equilibrium of weighted door

In summary: The answer to all of these is yes. In fact, the torque exerted by each hinge increases linearly with the distance from the center of the hinge to the door. So if we choose the lower hinge as the point about which 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?The answer to all of these is yes. In fact, the torque exerted by each hinge increases linearly with the distance from the center of the hinge to the door.
  • #1
Quincy
228
0

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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  • #2
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.
 
  • #3
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?
 
  • #4
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?
 

FAQ: Static Equilibrium of weighted door

1. What is static equilibrium?

Static equilibrium refers to a state in which all forces acting on an object are balanced, resulting in no net acceleration or movement.

2. How does a weighted door achieve static equilibrium?

A weighted door can achieve static equilibrium by having the forces of gravity and the normal force from the hinges balanced. This means that the weight of the door is evenly distributed and there is no net torque acting on the door.

3. What factors affect the static equilibrium of a weighted door?

The weight of the door, the position of the hinges, and any external forces acting on the door can affect the static equilibrium. Additionally, the strength and stability of the hinges can also play a role.

4. Can a weighted door ever lose static equilibrium?

Yes, if the weight of the door is not evenly distributed or if there is a sudden external force applied, the door can lose static equilibrium and start to move or swing open.

5. How is the static equilibrium of a weighted door calculated?

The static equilibrium of a weighted door can be calculated using the principles of torque. The weight of the door is multiplied by the distance from the hinge to find the torque, and this must be balanced by an equal and opposite torque from the normal force of the hinge.

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