Posted by La La on Sunday, September 30, 2012 at 12:20am.
Wb = m*g = 4kg * 9.8N/kg = 39.2 N. = Wt.
0f block.
Fb = 39.2N. @ 30o = Force of block.
Fp=39.2*sin30 = 19.6 N.=Force parallel to plane.
Fv = 39.2*cos30 = 33.9 N. = Force perpendicular to plane.
Fk = u*Fv = u*33.9.
Fn = Fp-Fk = m*a.
19.6 - 33.9u = 4*1.2 = 4.8
-33.9u = 4.8 - 19.6 = -14.8
u = 0.437 = Coefficient of kinetic friction.
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