Homework Help: Physics

Posted by Mike Joseph on Sunday, June 17, 2012 at 11:16am.

A 13.0 -kg box is released on a 33 degree incline and accelerates down the incline at 0.20 m/s^2

What is the coefficient of kinetic friction?

* If I know the friction force impeding the object motion is 67 N. How do I find the coefficient of kinetic friction?

Physics - Elena, Sunday, June 17, 2012 at 6:13pm
m•a=m•g•sinα – F(fr)
F(fr) = m•g•sinα –m•a
F(fr) =μ•N =μ•m•g•cosα
m•g•sinα –m•a = μ•m•g•cosα
μ = (g•sinα –a)/ g•cosα

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