M*g = 35 * 9.8 = 343 N. = wt. of carton.
Fp = 343*sin40 = 220.5 N. = Force parallel to the incline.
Fn = 343*cos40 = 262.8 N. = Normal force.
Fp-Fs = M*a.
220.5 - Fs = 35*0, Fs = 220.5 N. = Force of static friction.
A carton of mass 35kg is at rest on a rough plane inclined at an angle of 40 degrees to the horizontal.
Calculate the magnitude of the friction force in newtons.
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