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Posted by on Thursday, January 19, 2012 at 9:56am.

A 20kg mass is to be pulled up a slope inclined at 30 degree to the horizontal.If the efficiency of the plane is 75% find the force required to pull the load up the plane.

  • Physics - , Saturday, January 21, 2012 at 7:30pm

    Wm = 20 kg * 9.8 N./kg = 196 N. = Weight of mass.

    Fm = 196 N. @ 30 Deg. = Force of mass.
    Fp = 196*sin30 = 98 N. = Force parallel
    to plane.
    Fv = 196*cos30 = 169.7 N. = Force perpendicular to plane.

    Fn = 0.75Fap - Fp = 0,
    0.75Fap - 98 = 0,
    0.75Fap = 98,
    Fap = 130.7 N. = Force applied.

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