Statics Problem involving blocks, rope, pulleys and springs....

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SUMMARY

The discussion focuses on solving a statics problem involving blocks, ropes, pulleys, and springs, specifically addressing the calculation of the equivalent spring constant (Keq) and the tension in the system. Key equations utilized include the parallel and series spring equations: Keq = k1 + k2 for parallel springs and 1/Keq = 1/k1 + 1/k2 for series springs. The participants emphasize the importance of understanding the forces at various points in the system, particularly at points A and G, to derive the necessary tensions and moments without directly calculating Keq. The analysis suggests that the spring constant may not be essential for solving the initial questions posed in the problem.

PREREQUISITES
  • Understanding of statics principles, including force equilibrium.
  • Familiarity with spring mechanics, specifically parallel and series configurations.
  • Knowledge of free body diagrams (FBD) and moment calculations.
  • Ability to apply trigonometric functions to resolve forces at angles.
NEXT STEPS
  • Study the derivation and application of the equivalent spring constant in complex systems.
  • Learn how to construct and analyze free body diagrams for multi-body systems.
  • Explore the principles of tension in ropes and their relationship to pulleys in static equilibrium.
  • Investigate the calculation of moments about various points in a system to solve for unknown forces.
USEFUL FOR

Students in engineering mechanics, physics enthusiasts, and anyone tackling statics problems involving springs, pulleys, and forces in equilibrium.

jbakes

Homework Statement


Statics_zpss1j1d1dw.png

The angle at the bottom is 25 degrees

Homework Equations


Springs Parallel;
keq = k1 +k2
Sum Forces = f1 + f2
x = f1/k1 = f2/k2

Springs Series;
1/keq = 1/k1 + 1/k2
Sum x = x1 +x2
F = k1x1 =k2x2

The Attempt at a Solution


Basically I'm having trouble finding the spring constant (Keq)23
I've worked out all the diagrams and if I could just find the spring constant I could then plug it into my FBD@E and find the tension. Then from there I can plug the tension into my Moment equation and find the force in spring one and solve for x.
 

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I think you should show your working.

I haven't attempted to solve the problem (and not sure I can) but I note that they ask you to calculate the spring constant in Q3. That's possibly a clue that the spring constant isn't needed to work out the answer to Q1 and Q2.
 
Look at point A. That rope pulls up with a certain tension. This is tied to a spring, which must pull up with the same tension as the rope at A, since nothing is accelerating. So this brings us to point G: The spring must be pulling down at G with the same force as it is pulling up. You should be able to find the vertical forces at G, in terms of the main Tension and the angles. Take this upward force with the upward Tension at C, then the block B weight, and sum the moments about D, to solve for the Tension.
 

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