Unhinged -- Static Equilibrium for a Door

ErCeTe · Nov 7, 2017

Homework Statement

Diagram of a door in a wall opening, with hinge points A and B marked on the left edge at heights L/4 and 3L/4, the centre of mass C at the middle, and width d labelled along the bottom.

Printed text questions b through f about a door in static equilibrium: torque about points A and B, sum of torques, force balance equations, and hinge force vectors with equal upward components.

Homework Equations

Torque = r x F

The Attempt at a Solution

I expect the door to fall.

berkeman · Nov 7, 2017

ErCeTe said:

Homework Statement

View attachment 214532 View attachment 214533

Homework Equations

Torque = r x F

The Attempt at a Solution

I expect the door to fall.

Welcome to the PF.

ErCeTe said:

The Attempt at a Solution

I expect the door to fall.

That is your full solution to all of those questions and drawings? I'm not expecting you to get full marks for that solution...

ErCeTe · Nov 8, 2017

No, that was for a) only.

berkeman · Nov 8, 2017

ErCeTe said:

No, that was for a) only.

Well, first of all it's not correct (insufficient explanation of the door motion). Second, part a) asks for you to draw a number of things. Try again?

Unhinged -- Static Equilibrium for a Door

Homework Statement

Homework Equations

The Attempt at a Solution

Discussion

Homework Statement

Homework Equations

The Attempt at a Solution

The Attempt at a Solution

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