Solve Constrained Motion: Aa, Ab, Ac, Ad

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The discussion focuses on solving a constrained motion problem involving tensions in strings, specifically for points Aa, Ab, Ac, and Ad. The user calculated accelerations as Aa = -10 m/s², Ab = 0 m/s², Ac = 20 m/s², and Ad = -5 m/s², and seeks confirmation and guidance on calculating the tensions. The constraints used include equations derived from Newton's second law, specifically Fnet = ma, to analyze the forces acting on the system.

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http://img101.photolava.com/2009/10/21/engr-vswpt7nk.jpg
An old exam paper practice question. I can get up to b) but i am having trouble with the tensions.

I got for Aa=-10mms-2 Ad=-5mms-2, while Ac is given to be 20mms-2 and Ab=0mms-2.
Is this corrent and if so how do I go about solving question c?

This was done by creating the constraints.
2Aa + 2Ab + Ac = 0
2Ad - Aa - Ab = 0
 
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Welcome to PF!

Hi makeez! Welcome to PF! :smile:

(question c is the tension in the strings)

Start with good ol' Newton's second law for mass C … Fnet = ma :wink:
 

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