Bracket/block static friction problem (physics)

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SUMMARY

The discussion centers on solving a static friction problem involving a 12kg block and a 7kg bracket. The user struggles with drawing free body diagrams (FBDs) correctly, which is essential for applying the equations of motion. The key forces identified include gravitational force (m1g and m2g), normal forces (n1 and n2), tension (T), and static friction (fs). The user calculates static friction as 94.08 N but encounters difficulties due to multiple variables in their equations.

PREREQUISITES
  • Understanding of free body diagrams (FBDs)
  • Knowledge of static friction and its calculation (f = μN)
  • Familiarity with Newton's laws of motion
  • Basic algebra for solving equations with multiple variables
NEXT STEPS
  • Review the principles of drawing accurate free body diagrams
  • Study the concept of static friction and its role in equilibrium problems
  • Learn how to apply Newton's second law to systems with multiple objects
  • Practice solving similar static friction problems with varying weights and configurations
USEFUL FOR

Students studying physics, particularly those tackling mechanics and static friction problems, as well as educators looking for examples of common student misconceptions in free body diagram analysis.

notbynumber
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Homework Statement


http://img3.imageshack.us/img3/6618/5n6.jpg
Image there.


Homework Equations


Well this is actually where the problem occurs. You make your own equations.


The Attempt at a Solution


It's the friction that is really messing me up. I'm just so confused, I'm going to show you my attempt at FBDs for the problem.

I think that if I just know how to draw them correctly I'll be able to find my answer, unless there is some other tricky way to get it.

Okay so for the 12kg block, we have:

m1g going DOWN
n1 going UP
T to the LEFT
fs to the LEFT

And for the 7kg bracket, we have:

m2g going DOWN
n2 going UP
n1 going DOWN
T to the RIGHT?
fs to the RIGHT

Apparently I didn't draw them correctly because when I try to solve for something, there are always two variables... other than f = Mu*N which equals 94.08 N.
 
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Did I mention this is due soon? Please everyone, I really need your help.
 

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