Virtual work in a pulley system

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SUMMARY

The discussion centers on the mechanics of a pulley system involving a 1 kg mass. When the mass is displaced 1 unit upward, the corresponding displacement for point A is calculated as 1/2 unit downward, based on the sine of 30 degrees. The conversation highlights the necessity of applying an additional force to facilitate the movement of the 1 kg mass, indicating a change in geometry within the system. The original poster successfully resolved their query regarding the mechanics involved.

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new90
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Homework Statement
The system is in static equilibrium.Use the principle of virtual to find the weights of A and B.Neglect the weight of the strings and the friction of the pulley
Relevant Equations
no equation
If 1kg make a displacement of 1unit upward then A make a 1/2unit down because 1/sin 30.after that i have no idea what do I will really need help.
Thanks!
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Last edited:
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In order for 1 Kg mass to move, an additional force would need to be applied on it and the geometry would change.
 
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Likes   Reactions: new90
ok thanks I already solve it
 

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