Understanding the Forces of a Moving Lift: T and T1

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Homework Help Overview

The problem involves analyzing the forces acting on a moving lift, specifically focusing on the tensions T and T1 under different conditions: when the lift is stationary and when it is accelerating. The subject area includes dynamics and force analysis.

Discussion Character

  • Exploratory, Assumption checking, Problem interpretation

Approaches and Questions Raised

  • The original poster attempts to calculate tensions T and T1 for both stationary and accelerating scenarios, questioning the correctness of their expressions. Some participants suggest drawing free body diagrams to clarify the forces involved.

Discussion Status

Participants are engaging in a back-and-forth discussion, with some confirming the original poster's reasoning while others emphasize the importance of proper sign assignment for acceleration. There is no explicit consensus, but guidance has been offered regarding the need for clarity in the free body diagrams.

Contextual Notes

There is mention of different masses (m and 2m) involved in the problem, which may influence the calculations of tensions. The discussion also highlights the need for careful consideration of the signs associated with acceleration.

Bandarigoda
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This is my problem,
uploadfromtaptalk1373171905114.jpg

ABCD is a lift.

1-- when the lift not moving i want the T and T1.
T1= 3mg
T= 2mg
Right ?

2-- when the lift is moving with accelartion a. I want to know the new T and T1.
Are they
T1 = 3m(g+a)
T = 2m(g+a)

Am i doing it right?
 
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Please show your reasoning.
Are the masses not equal then? I don't see that on your diagram.
You should draw separate free body diagrams for each mass.
 
First mass is m
Second one is 2m
 
That looks right. Just make sure you assign the correct +/- sign to 'a'.
 
NascentOxygen said:
That looks right. Just make sure you assign the correct +/- sign to 'a'.

Yeah, thank you sir
 

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