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December 21, 2014

December 21, 2014

Posted by **garth** on Thursday, June 7, 2012 at 8:27pm.

- physics -
**Henry**, Friday, June 8, 2012 at 1:10amGiven: Fs = 0.38, Fk = 0.28, m = ?.

Did you forget the mass?

Mass = 30kg(Assumed).

Wb = m*g = 30kg * 9.8N/kg = 294 N. =

Weight of box.

Fb = 294N @ 0 Deg. = Force of box.

Fp=294*sin(0)=0=Force parallel to floor

Fv = 294*cos(0) = 294 N. = Force perpendicular to floor.

Fn = Fp - u*Fv -u*Fv' = m*a. a = 0.

0 - 0.38*294 - 0.38Fv' = 0

-0.38Fv' = 0.38*294 = 111.72

Fv' = - 294 N.

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