Fig.3.10 below snows a lever in use
(a) To which class of lever does it belong?
(b) If AB=1 m, AF = 0.4 m,find its mechanical advantage
(c) Calculate the value of E.

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Solution

(a) It is second class lever

(b) Given,

$A B = 1 m, A F = 0.4 m a n d$

$B F = 1 - 0.4 = 0.6 m$

Mechanical advantage = load/effort = $\frac{B F}{A F} = \frac{0.6}{0.4} = 1.5$

(c) Moment at point F is zero

$L o a d \times A F = E f f o r t \times B F$

$E f f o r t = \frac{L o a d \times A F}{B F} = \frac{15 \times 0.4}{0.6} = 10 k g f$

Value of $E = 10 k g f$

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