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Physics find angle of inclined plane! help?

  • Thread starter crosbykins
  • Start date
  • #1
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URGENT physics find angle of inclined plane! help!?

Homework Statement



A block slides down an inclined plane at a constant velocity of 0.14m/s. The coefficient of kinetic friction is 0.45. What is the angle of inclination?



Homework Equations


Fnetx = Fk -mgsintheta
Fnety = FN -mgcostheta


The Attempt at a Solution



FN-mgcosΘ = 0
FN =mgcosΘ

FN µK –mgsinΘ =0
FN = mgsinΘ/.45

mgcosΘ = mgsinΘ/.45
.45 = mgsinΘ/ mgcosΘ
.45 = tanΘ
tan-1.45 =Θ
24⁰ =Θ

Is this correct? What I don't understand is that shouldn't Fnetx include an Fapp? The question doesn't give a value for Fapp so I don't how you would use it to find the answer.
 

Answers and Replies

  • #2
tiny-tim
Science Advisor
Homework Helper
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hi crosbykins! :smile:

(have a smaller theta: θ and try using the X2 icon just above the Reply box :wink:)
What I don't understand is that shouldn't Fnetx include an Fapp? The question doesn't give a value for Fapp so I don't how you would use it to find the answer.
yes that looks fine :smile:

i'm not sure what you mean by Fapp

the block is simply sliding under gravity (any force that pushed it to get it started has been removed)
 
  • #3
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Thank you so much for the help tiny-tim!
 

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