Finding Forces in Static Equilibrium

AI Thread Summary
To solve problems involving forces in static equilibrium, analyze the forces at the junction where the cords meet. Understand that equilibrium indicates the net force in any direction is zero, meaning the total upward force must equal the downward force. Break the forces into horizontal components to create a vector diagram. Use trigonometry to determine the upward force exerted by the second cord, which counteracts the weight acting downward. This method effectively allows for the calculation of forces in static equilibrium situations.
honestliar
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I have no basic idea about this lesson, how can you solve for this problem?


http://tinypic.com/m/5aizk3/3

thanks
 
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are you given any other information?
 
no, that's all
 
You have all the information needed. Hint: Analyze the forces acting at the point where the cords meet. What does equilibrium tell you about the net force in any direction?
 
From that you can see that the total force upwards has to be provided by the second chord. So you break the chord into horizontal components. by doing this you are turning it into a vector diagram(pic)

from this you can use triginometry to find the force being exerted up, which will be opposite the force down, which in turn is the weight.
 

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