Proving Friction on an Inclined Surface

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To prove the equation µk = m/M * sec a - tan a for a mass moving with constant velocity on an inclined surface, clarity in the question is essential. Participants emphasize the need for a complete problem statement and encourage sharing initial thoughts to facilitate understanding. Additionally, the original poster is advised to provide a clearer image of their work for better assistance. Engaging in these practices will enhance the discussion and lead to more effective help. Clear communication is crucial for solving physics problems effectively.
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
Picture1.png

: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! =]
 
Thread 'Variable mass system : water sprayed into a moving container'

Thread 'Variable mass system : water sprayed into a moving container'

Starting with the mass considerations #m(t)# is mass of water #M_{c}# mass of container and #M(t)# mass of total system $$M(t) = M_{C} + m(t)$$ $$\Rightarrow \frac{dM(t)}{dt} = \frac{dm(t)}{dt}$$ $$P_i = Mv + u \, dm$$ $$P_f = (M + dm)(v + dv)$$ $$\Delta P = M \, dv + (v - u) \, dm$$ $$F = \frac{dP}{dt} = M \frac{dv}{dt} + (v - u) \frac{dm}{dt}$$ $$F = u \frac{dm}{dt} = \rho A u^2$$ from conservation of momentum , the cannon recoils with the same force which it applies. $$\quad \frac{dm}{dt}...
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