Solving Pulleys and Forces Homework Problem

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SUMMARY

The discussion centers on solving a physics problem involving a mass of 12.5 kg suspended by pulleys, requiring the calculation of the force needed to keep the mass at rest. The key principle applied is that the net force must equal zero due to static equilibrium. Participants recommend drawing free body diagrams for each pulley and summing the forces in both the x and y directions to simplify the problem-solving process.

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  • Understanding of static equilibrium principles
  • Knowledge of free body diagrams
  • Familiarity with Newton's laws of motion
  • Basic algebra for force calculations
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  • Learn how to construct and analyze free body diagrams
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Homework Statement


An object of mass 12.5 kg hangs from very light pulleys as shown here:
http://i26.tinypic.com/24lq5b4.jpg
What force must be applied to the rope so that the mass stays at rest?

Homework Equations


Fnet = ma...

The Attempt at a Solution


I am really clueless when it comes to this question. I know the net force must be 0 because there is no acceleration occurring b/c it must be at rest. Please help.
 
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You are correct by saying that the net force must be 0, since the system will be in static equilibrium.
Try drawing a free body diagram for each pulley.
If you correctly label the tensions in the strings and sum up the forces in both the x and y directions, the problem will become much easier.
 

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