A crow bar 3 m long supported on a stone lifts a load of 150 kgf. If effort applied is 30 kgf, find the distance of the support from the load.
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Explanation:
Length of crow bar = 2m
length of load arm = 0.1 m
length of effort arm = length of crow bar - length of load arm
= 2 - 0.1 = 1.9m
so, velocity ratio = length of effort arm/length of load arm = 1.9/0.1 = 19
use formula, velocity ratio = load/effort
19 = 100kgf/effort
effort = 100/19 = 5.26 kgf
hence, 5.26 effort is required.
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