Proving Friction on an Inclined Surface

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majdeee
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Friction HELP!

if we have a mass on an inclined surface moves with a constant velocity Prove that:
µk=m/M*sec a -tan a
Handwritten derivation in black, green and red ink on white: Newton's 2nd law m a = sum F_i gives m a_par = W_par - f_k; kinetic friction f_k = mu_k F_N = mu_k W_perp = mu_k mg cos theta_max; partial equation a_par = g(sin theta_max - mu_k cos theta_max).

:cry: :cry:
 
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You need to state the exact question in order for anyone to understand what the question is asking! Also, since it is homework, please show some of your own thoughts on the question.
 
The end of that is cut off, and again, you've not posted the question!
 
Please edit the picture so that we can actually see all of your work! =]