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Question
In a lever, the fulcrum is at one end at a distance of 30 cm from the load and effort is at the other end at a distance of 90 cm from the load. Find :
(a) the length of load arm,
(b) the length of effort arm, and
(c) the mechanical advantage of the lever.
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Solution
Given,
(a) Load arm = 30 cm
(b) Effort arm = (90 + 30) cm = 120 cm
(c) Mechanical advantage = `"Effort arm"/"Load arm"`
= `"120 cm"/"30 cm"`
= 4
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