How can I accurately measure the force applied to my door to calculate its mass?

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Homework Help Overview

The original poster attempts to calculate the mass of a wooden door using torque and angular acceleration, without removing the door from its hinges. The discussion revolves around measuring the force applied to the door to facilitate this calculation.

Discussion Character

  • Exploratory, Conceptual clarification, Problem interpretation

Approaches and Questions Raised

  • Participants discuss various methods to measure the force applied to the door, including the use of a spring balance and the concept of simple harmonic oscillation. There are questions about the feasibility of neglecting friction from the hinges and the original poster's reasoning behind their approach.

Discussion Status

Some participants have offered suggestions for measuring force, while others have raised questions about the original poster's methods and motivations. The discussion is ongoing, with multiple approaches being explored.

Contextual Notes

There is a mention of constraints regarding the original poster's desire to avoid removing the door from its hinges, as well as their interest in applying this method in scenarios where traditional measurements may not be possible.

yasar1967
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I am trying to calculate the mass of my wooden room door without taken them off their hinges using the torque and angular acceleration formulas.
I have ang. acc. (how much time passed calculated when door passed certain radian by certain push from me).
Rotational inertia is calculated by treating the door as flat area (metal locking has been taken into consideration -but not the friction force from hinges, I guess they're well oiled and fraction can be neglected, right?)

The problem is the force I applied. How can I measure it accurately?
If I could find a way to do it I can easily measure the door's mass.

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The Attempt at a Solution

 
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How about a spring balance?
 
elaborate please
 
Look it up. It's a spring with some form of attachment at either end and a calibrated gauge in the middle to show how much the spring is stretched (hence reading off the force via Hooke's law).
 
there is a way to measure the mass of the door without measuring force. however, it still requires a strong spring:

Simple Harmonic oscillation.

you just need to know k, and then count the period!
 
taking the door off the hinges and putting it on a weight scaler would be easier perhaps but that's NOT the point, this method can be applied to situations where no other way of calculation is possible. Besides, it's fun.
 
Why do you want to do this determination? Is it for a school project?
 
I study Physics at leisure. It's my hobby. Solving problem and contemplating about the world we live in makes me feel good, that's all.
 

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