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# Mechanics Question watch

1. This is a rather easy question from M2 but I'm doing very well at figuring out what a need to do. A brick has mass 4Kg and the coefficient of friction is 0.7. I have to find the angle of the slope the brick is on which its about to slide down on.

I know when calculating friction F=uR (where u is the coefficient of friction) and on a slope mgsin *angle symbol*= umgcos *angle symbol*

(m is the mass of the brick and g is 9.8) but I can't get the angle by itself. The answer is supposed to be 35 degrees. Please help.
2. ur m and g cancels out, so ur left with sin = ucos, divide thru by the cos, ull get tan = u then u shud be able to the angle from there
3. Oh great thanks. I was thinking I had to use tan. So I would get 35 by tan^-1 0.7.

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Updated: February 11, 2010
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