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November 25, 2014

November 25, 2014

Posted by **nate** on Thursday, September 27, 2012 at 12:49pm.

- physics -
**Henry**, Friday, September 28, 2012 at 6:19pmWl = mg = 188kg * 9.8N/kg = 1842 N. =

Wt. of Log.

Fl = 1842N @ 30o =Force of Log.

Fp = 1842*sin30 = 921 N.=Force parallel to hill.

Fv = 1842*cos30 = 1595 N. = Force perpendicular to the hill.

Fk = u*Fv = 0.9*1595 = 1436 N = Force of kinetic friction.

Fn = Fap-Fp-Fk = m*a.

Fap-921-1436 = 188*0.74

Fap-2357 = 139

Fap = 139+2357 = 2496 N.=Force applied.

= Strength of rope.

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