How Do You Calculate the Coefficient of Friction in a Spring Problem?

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SUMMARY

The discussion focuses on calculating the coefficient of friction in a spring problem using energy equations. The user initially misapplies the energy conservation formula, leading to an incorrect calculation of the coefficient of kinetic friction (uk). The correct approach involves incorporating the force of friction multiplied by the distance into the energy equation, which resolves the discrepancy in the answer. This highlights the importance of correctly applying energy principles in physics problems.

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  • Understanding of energy conservation principles in physics
  • Familiarity with spring potential energy calculations
  • Knowledge of friction and its coefficients
  • Basic algebra for solving equations
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Homework Statement



Question 6

http://web.viu.ca/hearnd/Courses/Phys121/F02Test2/Page3.htm"

Homework Equations



(Eps+EK)i-Ffr= (Eps+Ek)f

The Attempt at a Solution



both kinetics should be zero so..

1/2(50Nm)(0.10m)2+0-(0.50kg)(9.81m/s2)uk= 1/2(50Nm)(-0.08m)2+0

uk= (0.25-0.16)/(0.5kg)(9.81m/s2)

this must be wrong the posted answer is different then this would yield. This seems like a very straightforward question what am I missing?

Thanks
 
Last edited by a moderator:
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figured it out...
Force of friction x distance in an energy equation duh.
 

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