A load of 600 N is lifted by using a lever of 4 meter effort arm applying an effort of 200 N. If the load arm is 1 meter, calculate MA,VR and Efficiency of the lever.
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Load (l) = 680N
Effort (E) = 500N
Length of slope (l) = 12m
Height of slope (h) = 8 m
Now,
Output work = load * height
680 *8 = 5.44 *103 J
Input work = effort * length = 500 *12 = 6000J
Mechanical advantage (M.A)
= loadeffort= 600500=1.36
Velocity ratio (V.R) =lh=128 = 1.5
Efficiency =M.A100%V.R= 90.6%
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